Split PrefService into PrefService, PrefServiceSimple and PrefServiceSyncable.

chrome/browser/web_resource/plugins_resource_service.h

Index: chrome/browser/web_resource/plugins_resource_service.h
diff --git a/chrome/browser/web_resource/plugins_resource_service.h b/chrome/browser/web_resource/plugins_resource_service.h
index 7114cc7850fc1083fb84c235471504f69e0168e3..d01597e7b270ec40ab44c9b9da15f1761ddce7af 100644
--- a/chrome/browser/web_resource/plugins_resource_service.h
+++ b/chrome/browser/web_resource/plugins_resource_service.h
@@ -7,13 +7,16 @@
 
 #include "chrome/browser/web_resource/web_resource_service.h"
 
+class PrefService;
+class PrefServiceSimple;
+
 // This resource service periodically fetches plug-in metadata
 // from a remote server and updates local state and PluginFinder.
 class PluginsResourceService : public WebResourceService {
  public:
   explicit PluginsResourceService(PrefService* local_state);
 
-  static void RegisterPrefs(PrefService* local_state);
+  static void RegisterPrefs(PrefServiceSimple* local_state);
 
  private:
   virtual ~PluginsResourceService();