Don't require VDAs to return all PictureBuffers at once.

content/common/gpu/media/android_deferred_rendering_backing_strategy.cc

Index: content/common/gpu/media/android_deferred_rendering_backing_strategy.cc
diff --git a/content/common/gpu/media/android_deferred_rendering_backing_strategy.cc b/content/common/gpu/media/android_deferred_rendering_backing_strategy.cc
index 78472bc239bf977ca90a00591afb4aa504cd515a..4075c9697b80dff0ef5a07169818e4b699067fa4 100644
--- a/content/common/gpu/media/android_deferred_rendering_backing_strategy.cc
+++ b/content/common/gpu/media/android_deferred_rendering_backing_strategy.cc
@@ -18,11 +18,6 @@
 
 namespace content {
 
-// TODO(liberato): This is an entirely made-up number.  It depends on how
-// many decoded buffers that the MediaCodec is willing to have outstanding
-// at any one time.  Only one is guaranteed.  crbug.com/531606.
-enum { kNumPictureBuffers = 3 };
-
 AndroidDeferredRenderingBackingStrategy::
     AndroidDeferredRenderingBackingStrategy()
     : state_provider_(nullptr), media_codec_(nullptr) {}
@@ -47,10 +42,6 @@ void AndroidDeferredRenderingBackingStrategy::Cleanup(
   }
 }
 
-uint32 AndroidDeferredRenderingBackingStrategy::GetNumPictureBuffers() const {
-  return kNumPictureBuffers;
-}
-
 uint32 AndroidDeferredRenderingBackingStrategy::GetTextureTarget() const {
   return GL_TEXTURE_EXTERNAL_OES;
 }