Split PrefService into PrefService, PrefServiceSimple and PrefServiceSyncable.

chrome/browser/task_manager/task_manager.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_TASK_MANAGER_TASK_MANAGER_H_
 #define CHROME_BROWSER_TASK_MANAGER_TASK_MANAGER_H_
 
 #include <map>
 #include <utility>
 #include <vector>
 
 #include "base/basictypes.h"
 #include "base/gtest_prod_util.h"
 #include "base/memory/ref_counted.h"
 #include "base/memory/singleton.h"
 #include "base/observer_list.h"
 #include "base/process_util.h"
 #include "base/string16.h"
 #include "base/timer.h"
 #include "chrome/browser/renderer_host/web_cache_manager.h"
 #include "content/public/common/gpu_memory_stats.h"
 #include "third_party/WebKit/Source/WebKit/chromium/public/WebCache.h"
 
+class PrefServiceSimple;
 class TaskManagerModel;
 class TaskManagerModelGpuDataManagerObserver;
 
 namespace base {
 class ProcessMetrics;
 }
 
 namespace content {
 class WebContents;
 }
@@ skipping 143 matching lines @@
                                                int routing_id) = 0;
     virtual void StartUpdating() = 0;
     virtual void StopUpdating() = 0;
 
    protected:
     friend class base::RefCountedThreadSafe<ResourceProvider>;
 
     virtual ~ResourceProvider() {}
   };
 
-  static void RegisterPrefs(PrefService* prefs);
+  static void RegisterPrefs(PrefServiceSimple* prefs);
 
   // Returns true if the process at the specified index is the browser process.
   bool IsBrowserProcess(int index) const;
 
   // Terminates the process at the specified index.
   void KillProcess(int index);
 
   // Activates the browser tab associated with the process in the specified
   // index.
   void ActivateProcess(int index);
@@ skipping 415 matching lines @@
   int last_unique_id_;
 
   // Buffer for coalescing BytesReadParam so we don't have to post a task on
   // each NotifyBytesRead() call.
   std::vector<BytesReadParam> bytes_read_buffer_;
 
   DISALLOW_COPY_AND_ASSIGN(TaskManagerModel);
 };
 
 #endif  // CHROME_BROWSER_TASK_MANAGER_TASK_MANAGER_H_