Move the parsing of "chrome_url_overrides" out of Extension.

chrome/browser/extensions/manifest_url_parser.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_BROWSER_EXTENSIONS_MANIFEST_URL_PARSER_H_
 #define CHROME_BROWSER_EXTENSIONS_MANIFEST_URL_PARSER_H_
 
 #include "base/basictypes.h"
 #include "chrome/browser/extensions/api/profile_keyed_api_factory.h"
+#include "content/public/browser/notification_observer.h"
+#include "content/public/browser/notification_registrar.h"
 
 class Profile;
 
 namespace extensions {
 
-class ManifestURLParser : public ProfileKeyedAPI {
+class ManifestURLParser : public ProfileKeyedAPI,
+                          public content::NotificationObserver {
  public:
   explicit ManifestURLParser(Profile* profile);
   virtual ~ManifestURLParser();
 
   // ProfileKeyedAPI implementation.
   static ProfileKeyedAPIFactory<ManifestURLParser>* GetFactoryInstance();
 
+  // content::NotificationObserver implementation.
+  virtual void Observe(int type,
+                       const content::NotificationSource& source,
+                       const content::NotificationDetails& details) OVERRIDE;
+
  private:
   friend class ProfileKeyedAPIFactory<ManifestURLParser>;
 
   // ProfileKeyedAPI implementation.
   static const char* service_name() {
     return "ManifestURLParser";
   }
   static const bool kServiceIsNULLWhileTesting = true;
 
+  Profile* const profile_;
+  content::NotificationRegistrar registrar_;
+
   DISALLOW_COPY_AND_ASSIGN(ManifestURLParser);
 };
 
 }  // namespace extensions
 
 #endif  // CHROME_BROWSER_EXTENSIONS_MANIFEST_URL_PARSER_H_