Refactor preference syncing.

chrome/browser/autofill/autofill_manager.cc

Index: chrome/browser/autofill/autofill_manager.cc
diff --git a/chrome/browser/autofill/autofill_manager.cc b/chrome/browser/autofill/autofill_manager.cc
index 699b93d00d696fe0d448a8ff124340f6609ec326..c5f6781e284d360e92466c071f1dfef1525c5cc1 100644
--- a/chrome/browser/autofill/autofill_manager.cc
+++ b/chrome/browser/autofill/autofill_manager.cc
@@ -250,16 +250,24 @@ void AutofillManager::RegisterBrowserPrefs(PrefService* prefs) {
 
 // static
 void AutofillManager::RegisterUserPrefs(PrefService* prefs) {
-  prefs->RegisterBooleanPref(prefs::kAutofillEnabled, true);
+  prefs->RegisterBooleanPref(prefs::kAutofillEnabled,
+                             true,
+                             PrefService::SYNCABLE_PREF);
 #if defined(OS_MACOSX)
-  prefs->RegisterBooleanPref(prefs::kAutofillAuxiliaryProfilesEnabled, true);
+  prefs->RegisterBooleanPref(prefs::kAutofillAuxiliaryProfilesEnabled,
+                             true,
+                             PrefService::SYNCABLE_PREF);
 #else
-  prefs->RegisterBooleanPref(prefs::kAutofillAuxiliaryProfilesEnabled, false);
+  prefs->RegisterBooleanPref(prefs::kAutofillAuxiliaryProfilesEnabled,
+                             false,
+                             PrefService::UNSYNCABLE_PREF);
 #endif
   prefs->RegisterDoublePref(prefs::kAutofillPositiveUploadRate,
-                            kAutofillPositiveUploadRateDefaultValue);
+                            kAutofillPositiveUploadRateDefaultValue,
+                            PrefService::UNSYNCABLE_PREF);
   prefs->RegisterDoublePref(prefs::kAutofillNegativeUploadRate,
-                            kAutofillNegativeUploadRateDefaultValue);
+                            kAutofillNegativeUploadRateDefaultValue,
+                            PrefService::UNSYNCABLE_PREF);
 }
 
 void AutofillManager::DidNavigateMainFramePostCommit(