Split PrefService into PrefService, PrefServiceSimple and PrefServiceSyncable.

chrome/browser/browser_process.h

Index: chrome/browser/browser_process.h
diff --git a/chrome/browser/browser_process.h b/chrome/browser/browser_process.h
index 180aa1524b516f0d0fe83c5df0f736405009d442..d7dc6742dabde77d803002c14c72c2dab169c73b 100644
--- a/chrome/browser/browser_process.h
+++ b/chrome/browser/browser_process.h
@@ -28,7 +28,7 @@ class IntranetRedirectDetector;
 class IOThread;
 class MetricsService;
 class NotificationUIManager;
-class PrefService;
+class PrefServiceSimple;
 class Profile;
 class ProfileManager;
 class RenderWidgetSnapshotTaker;
@@ -96,7 +96,7 @@ class BrowserProcess {
   // Services: any of these getters may return NULL
   virtual MetricsService* metrics_service() = 0;
   virtual ProfileManager* profile_manager() = 0;
-  virtual PrefService* local_state() = 0;
+  virtual PrefServiceSimple* local_state() = 0;
   virtual net::URLRequestContextGetter* system_request_context() = 0;
   virtual chrome_variations::VariationsService* variations_service() = 0;