Remove unnecessary DefaultKeyStatus, DefaultKeyRequest and DefaultProvisionRequest.

Currently, we have KeyStatus, KeyRequest and ProvisionRequest as interface, so we can use
custom implementation for purpose such as wrapping native objects. However, these interfaces and the corresponding default classes are only used to bundle data, and in all existing implementation (including native code), it's just as efficient to just use the Java default implementation. Therefore we can just get rid of the interfaces, and change
the interfaces into classes with the default implementation.

-------------
Created by MOE: https://github.com/google/moe
MOE_MIGRATED_REVID=206765389

library/core/src/main/java/com/google/android/exoplayer2/drm/ExoMediaDrm.java

@@ -105,101 +105,63 @@ public interface ExoMediaDrm<T extends ExoMediaCrypto> {
         boolean hasNewUsableKey);
   }
 
-  /**
-   * @see android.media.MediaDrm.KeyStatus
-   */
-  interface KeyStatus {
-    /** Returns the status code for the key. */
-    int getStatusCode();
-    /** Returns the id for the key. */
-    byte[] getKeyId();
-  }
-
-  /**
-   * Default implementation of {@link KeyStatus}.
-   */
-  final class DefaultKeyStatus implements KeyStatus {
+  /** @see android.media.MediaDrm.KeyStatus */
+  final class KeyStatus {
 
     private final int statusCode;
     private final byte[] keyId;
 
-    DefaultKeyStatus(int statusCode, byte[] keyId) {
+    public KeyStatus(int statusCode, byte[] keyId) {
       this.statusCode = statusCode;
       this.keyId = keyId;
     }
 
-    @Override
     public int getStatusCode() {
       return statusCode;
     }
 
-    @Override
     public byte[] getKeyId() {
       return keyId;
     }
 
   }
 
-  /**
-   * @see android.media.MediaDrm.KeyRequest
-   */
-  interface KeyRequest {
-    byte[] getData();
-    String getDefaultUrl();
-  }
-
-  /**
-   * Default implementation of {@link KeyRequest}.
-   */
-  final class DefaultKeyRequest implements KeyRequest {
+  /** @see android.media.MediaDrm.KeyRequest */
+  final class KeyRequest {
 
     private final byte[] data;
     private final String defaultUrl;
 
-    public DefaultKeyRequest(byte[] data, String defaultUrl) {
+    public KeyRequest(byte[] data, String defaultUrl) {
       this.data = data;
       this.defaultUrl = defaultUrl;
     }
 
-    @Override
     public byte[] getData() {
       return data;
     }
 
-    @Override
     public String getDefaultUrl() {
       return defaultUrl;
     }
 
   }
 
-  /**
-   * @see android.media.MediaDrm.ProvisionRequest
-   */
-  interface ProvisionRequest {
-    byte[] getData();
-    String getDefaultUrl();
-  }
-
-  /**
-   * Default implementation of {@link ProvisionRequest}.
-   */
-  final class DefaultProvisionRequest implements ProvisionRequest {
+  /** @see android.media.MediaDrm.ProvisionRequest */
+  final class ProvisionRequest {
 
     private final byte[] data;
     private final String defaultUrl;
 
-    public DefaultProvisionRequest(byte[] data, String defaultUrl) {
+    public ProvisionRequest(byte[] data, String defaultUrl) {
       this.data = data;
       this.defaultUrl = defaultUrl;
     }
 
-    @Override
     public byte[] getData() {
       return data;
     }
 
-    @Override
     public String getDefaultUrl() {
       return defaultUrl;
     }

library/core/src/main/java/com/google/android/exoplayer2/drm/FrameworkMediaDrm.java

@@ -94,20 +94,26 @@ public final class FrameworkMediaDrm implements ExoMediaDrm<FrameworkMediaCrypto
     if (Util.SDK_INT < 23) {
       throw new UnsupportedOperationException();
     }
-    
-    mediaDrm.setOnKeyStatusChangeListener(listener == null ? null
-        : new MediaDrm.OnKeyStatusChangeListener() {
-          @Override
-          public void onKeyStatusChange(@NonNull MediaDrm md, @NonNull byte[] sessionId,
-              @NonNull List<MediaDrm.KeyStatus> keyInfo, boolean hasNewUsableKey) {
-            List<KeyStatus> exoKeyInfo = new ArrayList<>();
-            for (MediaDrm.KeyStatus keyStatus : keyInfo) {
-              exoKeyInfo.add(new DefaultKeyStatus(keyStatus.getStatusCode(), keyStatus.getKeyId()));
-            }
-            listener.onKeyStatusChange(FrameworkMediaDrm.this, sessionId, exoKeyInfo,
-                hasNewUsableKey);
-          }
-        }, null);
+
+    mediaDrm.setOnKeyStatusChangeListener(
+        listener == null
+            ? null
+            : new MediaDrm.OnKeyStatusChangeListener() {
+              @Override
+              public void onKeyStatusChange(
+                  @NonNull MediaDrm md,
+                  @NonNull byte[] sessionId,
+                  @NonNull List<MediaDrm.KeyStatus> keyInfo,
+                  boolean hasNewUsableKey) {
+                List<KeyStatus> exoKeyInfo = new ArrayList<>();
+                for (MediaDrm.KeyStatus keyStatus : keyInfo) {
+                  exoKeyInfo.add(new KeyStatus(keyStatus.getStatusCode(), keyStatus.getKeyId()));
+                }
+                listener.onKeyStatusChange(
+                    FrameworkMediaDrm.this, sessionId, exoKeyInfo, hasNewUsableKey);
+              }
+            },
+        null);
   }
 
   @Override
@@ -121,8 +127,13 @@ public final class FrameworkMediaDrm implements ExoMediaDrm<FrameworkMediaCrypto
   }
 
   @Override
-  public KeyRequest getKeyRequest(byte[] scope, byte[] init, String mimeType, int keyType,
-      HashMap<String, String> optionalParameters) throws NotProvisionedException {
+  public KeyRequest getKeyRequest(
+      byte[] scope,
+      byte[] init,
+      String mimeType,
+      int keyType,
+      HashMap<String, String> optionalParameters)
+      throws NotProvisionedException {
 
     // Prior to L the Widevine CDM required data to be extracted from the PSSH atom. Some Amazon
     // devices also required data to be extracted from the PSSH atom for PlayReady.
@@ -155,7 +166,7 @@ public final class FrameworkMediaDrm implements ExoMediaDrm<FrameworkMediaCrypto
       requestData = ClearKeyUtil.adjustRequestData(requestData);
     }
 
-    return new DefaultKeyRequest(requestData, request.getDefaultUrl());
+    return new KeyRequest(requestData, request.getDefaultUrl());
   }
 
   @Override
@@ -172,7 +183,7 @@ public final class FrameworkMediaDrm implements ExoMediaDrm<FrameworkMediaCrypto
   @Override
   public ProvisionRequest getProvisionRequest() {
     final MediaDrm.ProvisionRequest request = mediaDrm.getProvisionRequest();
-    return new DefaultProvisionRequest(request.getData(), request.getDefaultUrl());
+    return new ProvisionRequest(request.getData(), request.getDefaultUrl());
   }
 
   @Override