Fix various MediaSource related crashes on Android.

webkit/media/android/webmediaplayer_android.cc

Index: webkit/media/android/webmediaplayer_android.cc
diff --git a/webkit/media/android/webmediaplayer_android.cc b/webkit/media/android/webmediaplayer_android.cc
index 973c5f29bbda113c9df61ffc16523e42cc356e09..acfeb5d9b5e3fe9d76edfb6821f92c5f1350a109 100644
--- a/webkit/media/android/webmediaplayer_android.cc
+++ b/webkit/media/android/webmediaplayer_android.cc
@@ -21,7 +21,6 @@
 #include "third_party/WebKit/Source/WebKit/chromium/public/WebMediaPlayerClient.h"
 #include "third_party/WebKit/Source/WebKit/chromium/public/WebMediaSource.h"
 #include "third_party/WebKit/Source/WebKit/chromium/public/WebView.h"
-#include "webkit/media/android/media_source_delegate.h"
 #include "webkit/media/android/webmediaplayer_manager_android.h"
 #include "webkit/media/android/webmediaplayer_proxy_android.h"
 #include "webkit/media/webmediaplayer_util.h"
@@ -552,6 +551,7 @@ void WebMediaPlayerAndroid::Detach() {
     stream_id_ = 0;
   }
 
+  media_source_delegate_.reset();
   current_frame_ = NULL;
   manager_ = NULL;
   proxy_ = NULL;