WeakPtr destruction order cleanup: media edition.

media/filters/fake_video_decoder.h

Index: media/filters/fake_video_decoder.h
diff --git a/media/filters/fake_video_decoder.h b/media/filters/fake_video_decoder.h
index 417c83e783d84efb41475c2a162d36f9f8e0e252..3da6989eee443e8f3f4ce7f3332a2115a6bb90fe 100644
--- a/media/filters/fake_video_decoder.h
+++ b/media/filters/fake_video_decoder.h
@@ -74,8 +74,6 @@ class FakeVideoDecoder : public VideoDecoder {
   void DoStop();
 
   scoped_refptr<base::SingleThreadTaskRunner> task_runner_;
-  base::WeakPtrFactory<FakeVideoDecoder> weak_factory_;
-  base::WeakPtr<FakeVideoDecoder> weak_this_;
 
   const int decoding_delay_;
 
@@ -94,6 +92,9 @@ class FakeVideoDecoder : public VideoDecoder {
 
   int total_bytes_decoded_;
 
+  // NOTE: Weak pointers must be invalidated before all other member variables.
+  base::WeakPtrFactory<FakeVideoDecoder> weak_factory_;
+
   DISALLOW_COPY_AND_ASSIGN(FakeVideoDecoder);
 };