Split PrefService into PrefService, PrefServiceSimple and PrefServiceSyncable.

chrome/browser/prefs/browser_prefs.cc

Index: chrome/browser/prefs/browser_prefs.cc
diff --git a/chrome/browser/prefs/browser_prefs.cc b/chrome/browser/prefs/browser_prefs.cc
index 35829231a67c1b1b2f6692fb35c7dfd54c0753aa..ccddacb0caa2663184319dee1a2a8958e476da56 100644
--- a/chrome/browser/prefs/browser_prefs.cc
+++ b/chrome/browser/prefs/browser_prefs.cc
@@ -144,7 +144,7 @@ enum MigratedPreferences {
 
 namespace chrome {
 
-void RegisterLocalState(PrefService* local_state) {
+void RegisterLocalState(PrefServiceSimple* local_state) {
   // Prefs in Local State.
   local_state->RegisterIntegerPref(prefs::kMultipleProfilePrefMigration, 0);
 
@@ -218,7 +218,7 @@ void RegisterLocalState(PrefService* local_state) {
 #endif
 }
 
-void RegisterUserPrefs(PrefService* user_prefs) {
+void RegisterUserPrefs(PrefServiceSyncable* user_prefs) {
   // User prefs. Please keep this list alphabetized.
   AlternateErrorPageTabObserver::RegisterUserPrefs(user_prefs);
   AutofillManager::RegisterUserPrefs(user_prefs);