Convert main_render_frame_ to raw pointer in RenderViewImpl.

content/renderer/render_view_impl.h

Index: content/renderer/render_view_impl.h
diff --git a/content/renderer/render_view_impl.h b/content/renderer/render_view_impl.h
index 8e07711429a894e640884e6fc20f78aee7a1f3c5..9609e35258b9661b974229a017e1ed40bf34cb48 100644
--- a/content/renderer/render_view_impl.h
+++ b/content/renderer/render_view_impl.h
@@ -557,6 +557,7 @@ class CONTENT_EXPORT RenderViewImpl
   FRIEND_TEST_ALL_PREFIXES(RenderViewImplTest,
                            MessageOrderInDidChangeSelection);
   FRIEND_TEST_ALL_PREFIXES(RenderViewImplTest, SendCandidateWindowEvents);
+  FRIEND_TEST_ALL_PREFIXES(RenderViewImplTest, RenderFrameClearedAfterClose);
   FRIEND_TEST_ALL_PREFIXES(SuppressErrorPageTest, Suppresses);
   FRIEND_TEST_ALL_PREFIXES(SuppressErrorPageTest, DoesNotSuppress);
 
@@ -908,7 +909,7 @@ class CONTENT_EXPORT RenderViewImpl
 
   // Helper objects ------------------------------------------------------------
 
-  scoped_ptr<RenderFrameImpl> main_render_frame_;
+  RenderFrameImpl* main_render_frame_;
 
   // The next group of objects all implement RenderViewObserver, so are deleted
   // along with the RenderView automatically.  This is why we just store