Using WeakPtr for requests to MediaStreamDispatcher.

content/renderer/media/media_stream_impl.h

Index: content/renderer/media/media_stream_impl.h
diff --git a/content/renderer/media/media_stream_impl.h b/content/renderer/media/media_stream_impl.h
index 250fb0b0665d8b0b6bc47ebcd5ecfafa4a02241e..7a59582d9a4feaa267dc8ca0f2f567a2f355144f 100644
--- a/content/renderer/media/media_stream_impl.h
+++ b/content/renderer/media/media_stream_impl.h
@@ -14,6 +14,7 @@
 #include "base/gtest_prod_util.h"
 #include "base/memory/ref_counted.h"
 #include "base/memory/scoped_ptr.h"
+#include "base/memory/weak_ptr.h"
 #include "base/message_loop_proxy.h"
 #include "base/threading/non_thread_safe.h"
 #include "base/threading/thread.h"
@@ -61,7 +62,8 @@ class CONTENT_EXPORT MediaStreamImpl
       NON_EXPORTED_BASE(public webkit_media::MediaStreamClient),
       public MediaStreamDispatcherEventHandler,
       NON_EXPORTED_BASE(public base::NonThreadSafe),
-      public base::RefCountedThreadSafe<MediaStreamImpl> {
+      public base::RefCountedThreadSafe<MediaStreamImpl>,
+      public base::SupportsWeakPtr<MediaStreamImpl> {
  public:
   MediaStreamImpl(
       MediaStreamDispatcher* media_stream_dispatcher,