Remove content::NotificationObserver dependency from most Prefs code.

chrome/browser/browser_process_impl.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.
 
 // When each service is created, we set a flag indicating this. At this point,
 // the service initialization could fail or succeed. This allows us to remember
 // if we tried to create a service, and not try creating it over and over if
 // the creation failed.
 
 #ifndef CHROME_BROWSER_BROWSER_PROCESS_IMPL_H_
 #define CHROME_BROWSER_BROWSER_PROCESS_IMPL_H_
 
 #include <string>
 
 #include "base/basictypes.h"
 #include "base/debug/stack_trace.h"
 #include "base/memory/ref_counted.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/prefs/public/pref_change_registrar.h"
+#include "base/prefs/public/pref_observer.h"
 #include "base/threading/non_thread_safe.h"
 #include "base/timer.h"
 #include "chrome/browser/api/prefs/pref_member.h"
 #include "chrome/browser/browser_process.h"
-#include "content/public/browser/notification_observer.h"
 
 class ChromeNetLog;
 class ChromeResourceDispatcherHostDelegate;
 class CommandLine;
 class RemoteDebuggingServer;
 
 #if defined(ENABLE_PLUGIN_INSTALLATION)
 class PluginsResourceService;
 #endif
 
 namespace base {
 class SequencedTaskRunner;
 }
 
 namespace policy {
 class BrowserPolicyConnector;
 class PolicyService;
 };
 
 // Real implementation of BrowserProcess that creates and returns the services.
 class BrowserProcessImpl : public BrowserProcess,
                            public base::NonThreadSafe,
-                           public content::NotificationObserver {
+                           public PrefObserver {
  public:
   // |local_state_task_runner| must be a shutdown-blocking task runner.
   BrowserProcessImpl(base::SequencedTaskRunner* local_state_task_runner,
                      const CommandLine& command_line);
   virtual ~BrowserProcessImpl();
 
   // Called before the browser threads are created.
   void PreCreateThreads();
 
   // Called after the threads have been created but before the message loops
@@ skipping 57 matching lines @@
 #if (defined(OS_WIN) || defined(OS_LINUX)) && !defined(OS_CHROMEOS)
   virtual void StartAutoupdateTimer() OVERRIDE;
 #endif
 
   virtual ChromeNetLog* net_log() OVERRIDE;
   virtual prerender::PrerenderTracker* prerender_tracker() OVERRIDE;
   virtual ComponentUpdateService* component_updater() OVERRIDE;
   virtual CRLSetFetcher* crl_set_fetcher() OVERRIDE;
   virtual BookmarkPromptController* bookmark_prompt_controller() 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:
   void CreateMetricsService();
   void CreateWatchdogThread();
 #if defined(OS_CHROMEOS)
   void InitializeWebSocketProxyThread();
 #endif
   void CreateProfileManager();
   void CreateLocalState();
   void CreateViewedPageTracker();
@@ skipping 138 matching lines @@
   scoped_refptr<PluginsResourceService> plugins_resource_service_;
 #endif
   // TODO(eroman): Remove this when done debugging 113031. This tracks
   // the callstack which released the final module reference count.
   base::debug::StackTrace release_last_reference_callstack_;
 
   DISALLOW_COPY_AND_ASSIGN(BrowserProcessImpl);
 };
 
 #endif  // CHROME_BROWSER_BROWSER_PROCESS_IMPL_H_