Add compile time checks against longs being used in IPC structs on 32 bit Android.

extensions/renderer/extensions_render_frame_observer.h

 // Copyright 2014 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 EXTENSIONS_RENDERER_EXTENSIONS_RENDER_FRAME_OBSERVER_H_
 #define EXTENSIONS_RENDERER_EXTENSIONS_RENDER_FRAME_OBSERVER_H_
 
 #include <stdint.h>
 
 #include "base/macros.h"
 #include "content/public/renderer/render_frame_observer.h"
 
 namespace extensions {
 
 // This class holds the extensions specific parts of RenderFrame, and has the
 // same lifetime.
 class ExtensionsRenderFrameObserver
     : public content::RenderFrameObserver {
  public:
   explicit ExtensionsRenderFrameObserver(
       content::RenderFrame* render_frame);
   ~ExtensionsRenderFrameObserver() override;
 
  private:
   // RenderFrameObserver implementation.
   void DetailedConsoleMessageAdded(const base::string16& message,
                                    const base::string16& source,
                                    const base::string16& stack_trace,
-                                   int32_t line_number,
+                                   uint32_t line_number,
                                    int32_t severity_level) override;
 
   DISALLOW_COPY_AND_ASSIGN(ExtensionsRenderFrameObserver);
 };
 
 }  // namespace extensions
 
 #endif  // EXTENSIONS_RENDERER_EXTENSIONS_RENDER_FRAME_OBSERVER_H_