Remove unneeded unchecked warning suppressions

Most of these are no longer needed since https://github.com/google/ExoPlayer/commit/aa9eb5abc9b2b121db52d436215f40805928599c

Cleanup change automatically generated by error-prone refactoring
//java/com/google/devtools/staticanalysis/errorprone:UnnecessaryJavacSuppressWarnings_refactoring on targets third_party/java_src/android_libs/exoplayer/v2/... java/com/google/android/libraries/exoplayer/v2/...

PiperOrigin-RevId: 302916092

library/core/src/main/java/com/google/android/exoplayer2/audio/DecoderAudioRenderer.java

@@ -637,7 +637,6 @@ public abstract class DecoderAudioRenderer extends BaseRenderer implements Media
     decoderDrmSession = session;
   }
 
-  @SuppressWarnings("unchecked")
   private void onInputFormatChanged(FormatHolder formatHolder) throws ExoPlaybackException {
     Format newFormat = Assertions.checkNotNull(formatHolder.format);
     setSourceDrmSession(formatHolder.drmSession);

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

@@ -25,7 +25,6 @@ import com.google.android.exoplayer2.util.MediaSourceEventDispatcher;
 public interface DrmSessionManager {
 
   /** Returns {@link #DUMMY}. */
-  @SuppressWarnings("unchecked")
   static DrmSessionManager getDummyDrmSessionManager() {
     return DUMMY;
   }

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

@@ -104,7 +104,6 @@ public final class OfflineLicenseHelper {
    * @return A new instance which uses Widevine CDM.
    * @see DefaultDrmSessionManager.Builder
    */
-  @SuppressWarnings("unchecked")
   public static OfflineLicenseHelper newWidevineInstance(
       String defaultLicenseUrl,
       boolean forceDefaultLicenseUrl,
@@ -125,7 +124,6 @@ public final class OfflineLicenseHelper {
    *     MediaSourceEventDispatcher)} instead.
    */
   @Deprecated
-  @SuppressWarnings("unchecked")
   public OfflineLicenseHelper(
       UUID uuid,
       ExoMediaDrm.Provider mediaDrmProvider,

library/core/src/main/java/com/google/android/exoplayer2/mediacodec/MediaCodecRenderer.java

@@ -1355,7 +1355,6 @@ public abstract class MediaCodecRenderer extends BaseRenderer {
    * @param formatHolder A {@link FormatHolder} that holds the new {@link Format}.
    * @throws ExoPlaybackException If an error occurs re-initializing the {@link MediaCodec}.
    */
-  @SuppressWarnings("unchecked")
   protected void onInputFormatChanged(FormatHolder formatHolder) throws ExoPlaybackException {
     waitingForFirstSampleInFormat = true;
     Format newFormat = Assertions.checkNotNull(formatHolder.format);

library/core/src/main/java/com/google/android/exoplayer2/offline/DownloadHelper.java

@@ -798,7 +798,7 @@ public final class DownloadHelper {
   }
 
   // Initialization of array of Lists.
-  @SuppressWarnings({"unchecked", "rawtypes"})
+  @SuppressWarnings("unchecked")
   private void onMediaPrepared() {
     Assertions.checkNotNull(mediaPreparer);
     Assertions.checkNotNull(mediaPreparer.mediaPeriods);

library/core/src/main/java/com/google/android/exoplayer2/video/DecoderVideoRenderer.java

@@ -375,7 +375,6 @@ public abstract class DecoderVideoRenderer extends BaseRenderer {
    * @throws ExoPlaybackException If an error occurs (re-)initializing the decoder.
    */
   @CallSuper
-  @SuppressWarnings("unchecked")
   protected void onInputFormatChanged(FormatHolder formatHolder) throws ExoPlaybackException {
     waitingForFirstSampleInFormat = true;
     Format newFormat = Assertions.checkNotNull(formatHolder.format);

library/core/src/test/java/com/google/android/exoplayer2/source/SampleQueueTest.java

@@ -131,7 +131,6 @@ public final class SampleQueueTest {
   private DecoderInputBuffer inputBuffer;
 
   @Before
-  @SuppressWarnings("unchecked")
   public void setUp() {
     allocator = new DefaultAllocator(false, ALLOCATION_SIZE);
     mockDrmSessionManager = Mockito.mock(DrmSessionManager.class);
@@ -413,7 +412,6 @@ public final class SampleQueueTest {
   }
 
   @Test
-  @SuppressWarnings("unchecked")
   public void allowPlaceholderSessionPopulatesDrmSession() {
     when(mockDrmSession.getState()).thenReturn(DrmSession.STATE_OPENED_WITH_KEYS);
     DrmSession mockPlaceholderDrmSession = Mockito.mock(DrmSession.class);
@@ -459,7 +457,6 @@ public final class SampleQueueTest {
   }
 
   @Test
-  @SuppressWarnings("unchecked")
   public void trailingCryptoInfoInitializationVectorBytesZeroed() {
     when(mockDrmSession.getState()).thenReturn(DrmSession.STATE_OPENED_WITH_KEYS);
     DrmSession mockPlaceholderDrmSession = Mockito.mock(DrmSession.class);