Make RenderFrameImpl own its frame blame context

content/renderer/render_frame_impl.h

 // Copyright 2013 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_FRAME_IMPL_H_
 #define CONTENT_RENDERER_RENDER_FRAME_IMPL_H_
 
 #include <stddef.h>
 #include <stdint.h>
 
@@ skipping 1202 matching lines @@
 #if defined(ENABLE_WEBVR)
   // The VR dispatcher attached to the frame, lazily initialized.
   std::unique_ptr<VRDispatcher> vr_dispatcher_;
 #endif
 
 #if defined(OS_MACOSX) || defined(OS_ANDROID)
   // The external popup for the currently showing select popup.
   std::unique_ptr<ExternalPopupMenu> external_popup_menu_;
 #endif
 
-  FrameBlameContext* blame_context_;  // Not owned.
+  std::unique_ptr<FrameBlameContext> blame_context_;
 
   base::WeakPtrFactory<RenderFrameImpl> weak_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(RenderFrameImpl);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_RENDERER_RENDER_FRAME_IMPL_H_