Move IPC::MessageFilter and router to a separate file

chrome/browser/extensions/api/webstore/webstore_api.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 CHROME_BROWSER_EXTENSIONS_API_WEBSTORE_WEBSTORE_API_H_
 #define CHROME_BROWSER_EXTENSIONS_API_WEBSTORE_WEBSTORE_API_H_
 
 #include <list>
 #include <string>
 
 #include "base/memory/scoped_ptr.h"
 #include "base/scoped_observer.h"
 #include "chrome/browser/extensions/install_observer.h"
 #include "chrome/common/extensions/api/webstore/webstore_api_constants.h"
 #include "extensions/browser/browser_context_keyed_api_factory.h"
 #include "extensions/browser/event_router.h"
 
 namespace base {
 class ListValue;
 }
 
 namespace content {
 class BrowserContext;
 }
 
-namespace ipc {
+namespace IPC {
 class Sender;
 }
 
 namespace extensions {
 class InstallTracker;
 
 class WebstoreAPI : public BrowserContextKeyedAPI,
                     public InstallObserver {
  public:
   explicit WebstoreAPI(content::BrowserContext* browser_context);
@@ skipping 58 matching lines @@
   content::BrowserContext* browser_context_;
   scoped_ptr<ScopedObserver<InstallTracker, InstallObserver> >
       install_observer_;
 
   DISALLOW_COPY_AND_ASSIGN(WebstoreAPI);
 };
 
 }  // namespace extensions
 
 #endif  // CHROME_BROWSER_EXTENSIONS_API_WEBSTORE_WEBSTORE_API_H_