Update some #includes in chrome/renderer/extensions/ for headers in the new Platform directory

chrome/renderer/extensions/extension_helper.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 CHROME_RENDERER_EXTENSIONS_EXTENSION_HELPER_H_
 #define CHROME_RENDERER_EXTENSIONS_EXTENSION_HELPER_H_
 
 #include <map>
 #include <vector>
 
 #include "base/memory/linked_ptr.h"
 #include "base/memory/scoped_ptr.h"
 #include "chrome/common/view_type.h"
 #include "content/public/common/console_message_level.h"
 #include "content/public/renderer/render_view_observer.h"
 #include "content/public/renderer/render_view_observer_tracker.h"
-#include "third_party/WebKit/Source/WebKit/chromium/public/platform/WebURLResponse.h"
+#include "third_party/WebKit/Source/Platform/chromium/public/WebURLResponse.h"
 
 class GURL;
 class SkBitmap;
 struct ExtensionMsg_ExecuteCode_Params;
 struct WebApplicationInfo;
 
 namespace base {
 class ListValue;
 }
 
@@ skipping 114 matching lines @@
 
   // Id number of browser window which RenderView is attached to.
   int browser_window_id_;
 
   DISALLOW_COPY_AND_ASSIGN(ExtensionHelper);
 };
 
 }  // namespace extensions
 
 #endif  // CHROME_RENDERER_EXTENSIONS_EXTENSION_HELPER_H_