Fix RenderWidgetHostViewGuest leak.

content/browser/frame_host/render_widget_host_view_guest.h

Index: content/browser/frame_host/render_widget_host_view_guest.h
diff --git a/content/browser/frame_host/render_widget_host_view_guest.h b/content/browser/frame_host/render_widget_host_view_guest.h
index 9d83c3fb68141a5f5450dc16725d8867a0367bc8..f7e65a896f6c522f39b9b87200170f2b127772a1 100644
--- a/content/browser/frame_host/render_widget_host_view_guest.h
+++ b/content/browser/frame_host/render_widget_host_view_guest.h
@@ -41,9 +41,10 @@ class CONTENT_EXPORT RenderWidgetHostViewGuest
       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,
@@ -177,7 +178,7 @@ class CONTENT_EXPORT RenderWidgetHostViewGuest
   // 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