Fix RenderWidgetHostViewGuest leak.

content/browser/frame_host/render_widget_host_view_guest.h

 // Copyright 2014 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_FRAME_HOST_RENDER_WIDGET_HOST_VIEW_GUEST_H_
 #define CONTENT_BROWSER_FRAME_HOST_RENDER_WIDGET_HOST_VIEW_GUEST_H_
 
 #include <vector>
 
 #include "base/memory/scoped_ptr.h"
@@ skipping 23 matching lines @@
 // Eventually all RenderWidgetHostViewGuest code will be subsumed by
 // RenderWidgetHostViewChildFrame and this class will be removed.
 //
 // Some elements that are platform specific will be deal with by delegating
 // the relevant calls to the platform view.
 class CONTENT_EXPORT RenderWidgetHostViewGuest
     : public RenderWidgetHostViewChildFrame,
       public ui::GestureConsumer,
       public ui::GestureEventHelper {
  public:
-  RenderWidgetHostViewGuest(RenderWidgetHost* widget,
-                            BrowserPluginGuest* guest,
-                            RenderWidgetHostViewBase* platform_view);
+  RenderWidgetHostViewGuest(
+      RenderWidgetHost* widget,
+      BrowserPluginGuest* guest,
+      base::WeakPtr<RenderWidgetHostViewBase> platform_view);
   virtual ~RenderWidgetHostViewGuest();
 
   bool OnMessageReceivedFromEmbedder(const IPC::Message& message,
                                      RenderWidgetHostImpl* embedder);
 
   // RenderWidgetHostView implementation.
   virtual bool OnMessageReceived(const IPC::Message& msg) override;
   virtual void InitAsChild(gfx::NativeView parent_view) override;
   virtual void SetSize(const gfx::Size& size) override;
   virtual void SetBounds(const gfx::Rect& rect) override;
@@ skipping 113 matching lines @@
                           const gfx::Rect& guest_window_rect,
                           const blink::WebInputEvent* event);
 
   // BrowserPluginGuest and RenderWidgetHostViewGuest's lifetimes are not tied
   // to one another, therefore we access |guest_| through WeakPtr.
   base::WeakPtr<BrowserPluginGuest> guest_;
   gfx::Size size_;
   // The platform view for this RenderWidgetHostView.
   // RenderWidgetHostViewGuest mostly only cares about stuff related to
   // compositing, the rest are directly forwared to this |platform_view_|.
-  RenderWidgetHostViewBase* platform_view_;
+  base::WeakPtr<RenderWidgetHostViewBase> platform_view_;
 #if defined(USE_AURA)
   scoped_ptr<ui::GestureRecognizer> gesture_recognizer_;
 #endif
   DISALLOW_COPY_AND_ASSIGN(RenderWidgetHostViewGuest);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_FRAME_HOST_RENDER_WIDGET_HOST_VIEW_GUEST_H_