android: Fix ContentViewCore and RenderWidgetHostViewAndroid lifetime issue

content/browser/android/content_view_core_impl.h

 // Copyright 2012 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_ANDROID_CONTENT_VIEW_CORE_IMPL_H_
 #define CONTENT_BROWSER_ANDROID_CONTENT_VIEW_CORE_IMPL_H_
 
 #include <vector>
 
 #include "base/android/jni_android.h"
@@ skipping 47 matching lines @@
   virtual void ShowPastePopup(int x, int y) OVERRIDE;
   virtual unsigned int GetScaledContentTexture(
       float scale,
       gfx::Size* out_size) OVERRIDE;
   virtual float GetDpiScale() const OVERRIDE;
   virtual void RequestContentClipping(const gfx::Rect& clipping,
                                       const gfx::Size& content_size) OVERRIDE;
   virtual void PauseVideo() OVERRIDE;
   virtual void ResumeVideo() OVERRIDE;
   virtual void PauseOrResumeGeolocation(bool should_pause) OVERRIDE;
+  virtual void OnDetachedFromWebContents(WebContents* web_contents) OVERRIDE;
 
   // --------------------------------------------------------------------------
   // Methods called from Java via JNI
   // --------------------------------------------------------------------------
 
   base::android::ScopedJavaLocalRef<jobject> GetWebContentsAndroid(JNIEnv* env,
                                                                    jobject obj);
 
   void OnJavaContentViewCoreDestroyed(JNIEnv* env, jobject obj);
 
@@ skipping 317 matching lines @@
   bool geolocation_needs_pause_;
 
   DISALLOW_COPY_AND_ASSIGN(ContentViewCoreImpl);
 };
 
 bool RegisterContentViewCore(JNIEnv* env);
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_ANDROID_CONTENT_VIEW_CORE_IMPL_H_