Clear RenderFrameImpl::frame_ pointer after deleting it.

content/renderer/render_view_impl.h

 // Copyright (c) 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_RENDERER_RENDER_VIEW_IMPL_H_
 #define CONTENT_RENDERER_RENDER_VIEW_IMPL_H_
 
 #include <deque>
 #include <map>
 #include <set>
@@ skipping 510 matching lines @@
   friend class PepperDeviceTest;
   friend class RenderViewImplTest;
   friend class RenderViewTest;
   friend class RendererAccessibilityTest;
 
   // TODO(nasko): Temporarily friend RenderFrameImpl, so we don't duplicate
   // utility functions needed in both classes, while we move frame specific
   // code away from this class.
   friend class RenderFrameImpl;
 
+  FRIEND_TEST_ALL_PREFIXES(RenderViewImplTest, RenderFrameMessageAfterDetach);
   FRIEND_TEST_ALL_PREFIXES(RenderViewImplTest, DecideNavigationPolicyForWebUI);
   FRIEND_TEST_ALL_PREFIXES(RenderViewImplTest,
                            DidFailProvisionalLoadWithErrorForError);
   FRIEND_TEST_ALL_PREFIXES(RenderViewImplTest,
                            DidFailProvisionalLoadWithErrorForCancellation);
   FRIEND_TEST_ALL_PREFIXES(RenderViewImplTest, ImeComposition);
   FRIEND_TEST_ALL_PREFIXES(RenderViewImplTest, InsertCharacters);
   FRIEND_TEST_ALL_PREFIXES(RenderViewImplTest, JSBlockSentAfterPageLoad);
   FRIEND_TEST_ALL_PREFIXES(RenderViewImplTest, LastCommittedUpdateState);
   FRIEND_TEST_ALL_PREFIXES(RenderViewImplTest, OnHandleKeyboardEvent);
@@ skipping 508 matching lines @@
   // use the Observer interface to filter IPC messages and receive frame change
   // notifications.
   // ---------------------------------------------------------------------------
 
   DISALLOW_COPY_AND_ASSIGN(RenderViewImpl);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_RENDERER_RENDER_VIEW_IMPL_H_