Remove content::NotificationObserver dependency from most Prefs code.

chrome/browser/printing/cloud_print/cloud_print_proxy_service.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_PRINTING_CLOUD_PRINT_CLOUD_PRINT_PROXY_SERVICE_H_
 #define CHROME_BROWSER_PRINTING_CLOUD_PRINT_CLOUD_PRINT_PROXY_SERVICE_H_
 
 #include <string>
 #include <vector>
 
 #include "base/basictypes.h"
 #include "base/callback_forward.h"
 #include "base/memory/weak_ptr.h"
 #include "base/observer_list.h"
 #include "base/prefs/public/pref_change_registrar.h"
+#include "base/prefs/public/pref_observer.h"
 #include "chrome/browser/printing/cloud_print/cloud_print_setup_handler.h"
 #include "chrome/browser/profiles/profile_keyed_service.h"
-#include "content/public/browser/notification_observer.h"
 
 class Profile;
 class ServiceProcessControl;
 
 namespace cloud_print {
 struct CloudPrintProxyInfo;
 }  // namespace cloud_print
 
 // Layer between the browser user interface and the cloud print proxy code
 // running in the service process.
 class CloudPrintProxyService
     : public CloudPrintSetupHandlerDelegate,
       public ProfileKeyedService,
-      public content::NotificationObserver {
+      public PrefObserver {
  public:
   explicit CloudPrintProxyService(Profile* profile);
   virtual ~CloudPrintProxyService();
 
   // Initializes the object. This should be called every time an object of this
   // class is constructed.
   void Initialize();
 
   // Enables/disables cloud printing for the user
   virtual void EnableForUser(const std::string& lsid, const std::string& email);
@@ skipping 13 matching lines @@
   // disablement is verified, quit the browser. Returns true if the policy is
   // not set or the connector was not enabled.
   bool EnforceCloudPrintConnectorPolicyAndQuit();
 
   bool ShowTokenExpiredNotification();
   std::string proxy_id() const { return proxy_id_; }
 
   // CloudPrintSetupHandler::Delegate implementation.
   virtual void OnCloudPrintSetupClosed() OVERRIDE;
 
-  // content::NotificationObserver implementation.
-  virtual void Observe(int type,
-                       const content::NotificationSource& source,
-                       const content::NotificationDetails& details) OVERRIDE;
+  // PrefObserver implementation.
+  virtual void OnPreferenceChanged(PrefServiceBase* service,
+                                   const std::string& pref_name) OVERRIDE;
 
  private:
   // NotificationDelegate implementation for the token expired notification.
   class TokenExpiredNotificationDelegate;
   friend class TokenExpiredNotificationDelegate;
 
   Profile* profile_;
   scoped_refptr<TokenExpiredNotificationDelegate> token_expired_delegate_;
   scoped_ptr<CloudPrintSetupHandler> cloud_print_setup_handler_;
   std::string proxy_id_;
@@ skipping 36 matching lines @@
   PrefChangeRegistrar pref_change_registrar_;
 
   // If set, continue trying to disable the connector, and quit the process
   // once successful.
   bool enforcing_connector_policy_;
 
   DISALLOW_COPY_AND_ASSIGN(CloudPrintProxyService);
 };
 
 #endif  // CHROME_BROWSER_PRINTING_CLOUD_PRINT_CLOUD_PRINT_PROXY_SERVICE_H_