Why this CL triggers an OilPan crash.

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 <stddef.h>
 #include <stdint.h>
 
@@ skipping 751 matching lines @@
 
   // Bookkeeping to suppress redundant scroll and focus requests for an already
   // scrolled and focused editable node.
   bool has_scrolled_focused_editable_node_into_rect_;
   gfx::Rect rect_for_scrolled_focused_editable_node_;
 
   // Used to indicate the zoom level to be used during subframe loads, since
   // they should match page zoom level.
   double page_zoom_level_;
 
+  // Id of a related set of browsing contexts that this view belongs to.
+  int browsing_instance_id_;
+
   // Helper objects ------------------------------------------------------------
 
   RenderFrameImpl* main_render_frame_;
 
   // Note: RenderViewImpl is pulling double duty: it's the RenderWidget for the
   // "view", but it's also the RenderWidget for the main frame.
   blink::WebFrameWidget* frame_widget_;
 
   // The next group of objects all implement RenderViewObserver, so are deleted
   // along with the RenderView automatically.  This is why we just store
@@ skipping 47 matching lines @@
   // ---------------------------------------------------------------------------
 
   base::WeakPtrFactory<RenderViewImpl> weak_ptr_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(RenderViewImpl);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_RENDERER_RENDER_VIEW_IMPL_H_