Split PrefService into PrefService, PrefServiceSimple and PrefServiceSyncable.

chrome/browser/profiles/chrome_version_service.h

Index: chrome/browser/profiles/chrome_version_service.h
diff --git a/chrome/browser/profiles/chrome_version_service.h b/chrome/browser/profiles/chrome_version_service.h
index 425b8b867157c3082eae445ef2bd60e55f5f9d23..22d12993593db790c062183bb5569e7e82eba11e 100644
--- a/chrome/browser/profiles/chrome_version_service.h
+++ b/chrome/browser/profiles/chrome_version_service.h
@@ -10,13 +10,14 @@
 #include "base/basictypes.h"
 
 class PrefService;
+class PrefServiceSyncable;
 
 // This service manages a pref which is used to determine the version of
 // Chrome by which the profile was created.
 class ChromeVersionService {
  public:
   // Register the user pref we use.
-  static void RegisterUserPrefs(PrefService* prefs);
+  static void RegisterUserPrefs(PrefServiceSyncable* prefs);
 
   // Sets the version string in the pref for the current profile.
   static void SetVersion(PrefService* prefs, const std::string& version);