Remove PrefServiceSimple, replacing it with PrefService and PrefRegistrySimple.

chrome/browser/task_manager/task_manager.h

Index: chrome/browser/task_manager/task_manager.h
diff --git a/chrome/browser/task_manager/task_manager.h b/chrome/browser/task_manager/task_manager.h
index c1d3106361010565be0503b8054a8037a182348f..de72e0f94f8f1766f99c5d6ad915e68ca599a69e 100644
--- a/chrome/browser/task_manager/task_manager.h
+++ b/chrome/browser/task_manager/task_manager.h
@@ -22,7 +22,7 @@
 #include "content/public/common/gpu_memory_stats.h"
 #include "third_party/WebKit/Source/WebKit/chromium/public/WebCache.h"
 
-class PrefServiceSimple;
+class PrefRegistrarSimple;
 class TaskManagerModel;
 class TaskManagerModelGpuDataManagerObserver;
 
@@ -186,7 +186,7 @@ class TaskManager {
     virtual ~ResourceProvider() {}
   };
 
-  static void RegisterPrefs(PrefServiceSimple* prefs);
+  static void RegisterPrefs(PrefRegistrarSimple* prefs);
 
   // Returns true if the process at the specified index is the browser process.
   bool IsBrowserProcess(int index) const;