Pull files from the device cache after a MH test concludes.

PiperOrigin-RevId: 412251020

library/transformer/src/androidTest/java/com/google/android/exoplayer2/transformer/AndroidTestUtil.java

@@ -83,7 +83,6 @@ import org.checkerframework.checker.nullness.compatqual.NullableType;
 
     Uri uri = Uri.parse(uriString);
     File externalCacheFile = createExternalCacheFile(context, /* filePrefix= */ testId);
-    try {
     InstrumentationRegistry.getInstrumentation()
         .runOnMainSync(
             () -> {
@@ -104,9 +103,6 @@ import org.checkerframework.checker.nullness.compatqual.NullableType;
     }
     long outputSizeBytes = externalCacheFile.length();
     return new TransformationResult(outputSizeBytes);
-    } finally {
-      externalCacheFile.delete();
-    }
   }
 
   private static File createExternalCacheFile(Context context, String filePrefix)