[third_party] Avoid saving Robolectric shadow instances; instead, save the real…

[third_party] Avoid saving Robolectric shadow instances; instead, save the real framework object, and get its shadow when needed using Shadows.shadowOf(). Call Android framework methods directly on the framework object instead of its shadow whenever possible.

LSC: []
Additional details: []

Cleanup change automatically generated by javacflume/refactory
Refactoring: //third_party/java_src/robolectric/errorprone:ShadowUsageCheck

Tested:
    TAP --sample for global presubmit queue
    []

-------------
Created by MOE: https://github.com/google/moe
MOE_MIGRATED_REVID=207014379

testutils_robolectric/src/main/java/com/google/android/exoplayer2/testutil/RobolectricUtil.java

@@ -61,9 +61,9 @@ public final class RobolectricUtil {
 
 
     @Implementation
     @Implementation
     public static void loop() {
     public static void loop() {
-      ShadowLooper looper = shadowOf(Looper.myLooper());
-      if (looper instanceof CustomLooper) {
-        ((CustomLooper) looper).doLoop();
+      Looper looper = Looper.myLooper();
+      if (shadowOf(looper) instanceof CustomLooper) {
+        ((CustomLooper) shadowOf(looper)).doLoop();
       }
       }
     }
     }
 
 
@@ -161,9 +161,10 @@ public final class RobolectricUtil {
     @Implementation
     @Implementation
     @Override
     @Override
     public boolean enqueueMessage(Message msg, long when) {
     public boolean enqueueMessage(Message msg, long when) {
-      ShadowLooper looper = shadowOf(ShadowLooper.getLooperForThread(looperThread));
-      if (looper instanceof CustomLooper && looper != ShadowLooper.getShadowMainLooper()) {
-        ((CustomLooper) looper).addPendingMessage(msg, when);
+      Looper looper = ShadowLooper.getLooperForThread(looperThread);
+      if (shadowOf(looper) instanceof CustomLooper
+          && shadowOf(looper) != ShadowLooper.getShadowMainLooper()) {
+        ((CustomLooper) shadowOf(looper)).addPendingMessage(msg, when);
       } else {
       } else {
         super.enqueueMessage(msg, when);
         super.enqueueMessage(msg, when);
       }
       }
@@ -172,9 +173,10 @@ public final class RobolectricUtil {
 
 
     @Implementation
     @Implementation
     public void removeMessages(Handler handler, int what, Object object) {
     public void removeMessages(Handler handler, int what, Object object) {
-      ShadowLooper looper = shadowOf(ShadowLooper.getLooperForThread(looperThread));
-      if (looper instanceof CustomLooper && looper != ShadowLooper.getShadowMainLooper()) {
-        ((CustomLooper) looper).removeMessages(handler, what, object);
+      Looper looper = ShadowLooper.getLooperForThread(looperThread);
+      if (shadowOf(looper) instanceof CustomLooper
+          && shadowOf(looper) != ShadowLooper.getShadowMainLooper()) {
+        ((CustomLooper) shadowOf(looper)).removeMessages(handler, what, object);
       }
       }
     }
     }
   }
   }