Split PrefService into PrefService, PrefServiceSimple and PrefServiceSyncable.

chrome/browser/profiles/profile.h

Index: chrome/browser/profiles/profile.h
diff --git a/chrome/browser/profiles/profile.h b/chrome/browser/profiles/profile.h
index 47f1bb66d57fa4449b292d4d7de7e7d14184717c..a5dedb1ec1e02a67ea464666c2cdeba564e52b5a 100644
--- a/chrome/browser/profiles/profile.h
+++ b/chrome/browser/profiles/profile.h
@@ -24,7 +24,7 @@ class FaviconService;
 class GAIAInfoUpdateService;
 class HostContentSettingsMap;
 class PasswordStore;
-class PrefService;
+class PrefServiceSyncable;
 class PromoCounter;
 class ProtocolHandlerRegistry;
 class TestingProfile;
@@ -138,7 +138,7 @@ class Profile : public content::BrowserContext {
 
   // Profile prefs are registered as soon as the prefs are loaded for the first
   // time.
-  static void RegisterUserPrefs(PrefService* prefs);
+  static void RegisterUserPrefs(PrefServiceSyncable* prefs);
 
   // Gets task runner for I/O operations associated with |profile|.
   static scoped_refptr<base::SequencedTaskRunner> GetTaskRunnerForProfile(
@@ -214,9 +214,9 @@ class Profile : public content::BrowserContext {
   // Returns the PolicyService that provides policies for this profile.
   virtual policy::PolicyService* GetPolicyService() = 0;
 
-  // Retrieves a pointer to the PrefService that manages the preferences
+  // Retrieves a pointer to the PrefServiceSyncable that manages the preferences
   // for this user profile.
-  virtual PrefService* GetPrefs() = 0;
+  virtual PrefServiceSyncable* GetPrefs() = 0;
 
   // Retrieves a pointer to the PrefService that manages the preferences
   // for OffTheRecord Profiles.  This PrefService is lazily created the first