VideoDecodeAccelerator now SupportsWeakPtr instead of being RefCountedThreadSafe.

media/video/video_decode_accelerator.h

Index: media/video/video_decode_accelerator.h
diff --git a/media/video/video_decode_accelerator.h b/media/video/video_decode_accelerator.h
index 83d0b95631ca775fdfcb9ec34ef515568481f7dc..b7297ac056816a4dc532f61e9cadc97799635c33 100644
--- a/media/video/video_decode_accelerator.h
+++ b/media/video/video_decode_accelerator.h
@@ -8,6 +8,7 @@
 #include <vector>
 
 #include "base/basictypes.h"
+#include "base/memory/weak_ptr.h"
 #include "media/base/bitstream_buffer.h"
 #include "media/base/video_decoder_config.h"
 #include "media/video/picture.h"
@@ -18,12 +19,11 @@ namespace media {
 // Video decoder interface.
 // This interface is extended by the various components that ultimately
 // implement the backend of PPB_VideoDecode_Dev.
-//
-// No thread-safety guarantees are implied by the use of RefCountedThreadSafe
-// below.
 class MEDIA_EXPORT VideoDecodeAccelerator
-    : public base::RefCountedThreadSafe<VideoDecodeAccelerator> {
+    : public base::SupportsWeakPtr<VideoDecodeAccelerator> {
  public:
+  virtual ~VideoDecodeAccelerator();
+
   // Enumeration of potential errors generated by the API.
   // Note: Keep these in sync with PP_VideoDecodeError_Dev.
   enum Error {
@@ -127,11 +127,11 @@ class MEDIA_EXPORT VideoDecodeAccelerator
   // component is freed.  This call may asynchornously free system resources,
   // but its client-visible effects are synchronous.  After this method returns
   // no more callbacks will be made on the client.
-  virtual void Destroy() = 0;
-
- protected:
-  friend class base::RefCountedThreadSafe<VideoDecodeAccelerator>;
-  virtual ~VideoDecodeAccelerator();
+  // Because the client interface is synchronous but implementations may be
+  // asynchronous, the caller (who may own |this|) can pass ownership of the VDA
+  // *to* the VDA for hidden shenaniganary.  |self| may be NULL if ownership
+  // doesn't need to transfer.
+  virtual void Destroy(scoped_ptr<VideoDecodeAccelerator> self) = 0;
 };
 
 }  // namespace media