[Android] Stop all media on undoable close.

content/browser/web_contents/web_contents_android.h

 // Copyright 2013 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef CONTENT_BROWSER_WEB_CONTENTS_WEB_CONTENTS_ANDROID_H_
 #define CONTENT_BROWSER_WEB_CONTENTS_WEB_CONTENTS_ANDROID_H_
 
 #include <jni.h>
 
 #include "base/android/scoped_java_ref.h"
@@ skipping 46 matching lines @@
 
   // This method is invoked when a navigation transition is detected, to
   // determine if the embedder intends to handle it.
   bool WillHandleDeferAfterResponseStarted();
 
   // This method is invoked when a navigation transition has started.
   void DidStartNavigationTransitionForFrame(int64 frame_id);
 
   void OnHide(JNIEnv* env, jobject obj);
   void OnShow(JNIEnv* env, jobject obj);
+  void ReleaseMediaPlayers(JNIEnv* env, jobject jobj);
   void PauseVideo();
+
   void AddStyleSheetByURL(
       JNIEnv* env, jobject obj, jstring url);
   void ShowInterstitialPage(
       JNIEnv* env, jobject obj, jstring jurl, jlong delegate_ptr);
   jboolean IsShowingInterstitialPage(JNIEnv* env, jobject obj);
   jboolean IsRenderWidgetHostViewReady(JNIEnv* env, jobject obj);
   void ExitFullscreen(JNIEnv* env, jobject obj);
   void UpdateTopControlsState(
       JNIEnv* env,
       jobject obj,
@@ skipping 17 matching lines @@
   WebContents* web_contents_;
   NavigationControllerAndroid navigation_controller_;
   base::android::ScopedJavaGlobalRef<jobject> obj_;
 
   DISALLOW_COPY_AND_ASSIGN(WebContentsAndroid);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_WEB_CONTENTS_WEB_CONTENTS_ANDROID_H_