Refactor preference syncing.

chrome/browser/ui/cocoa/extensions/browser_actions_controller.mm

 // Copyright (c) 2011 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #import "browser_actions_controller.h"
 
 #include <cmath>
 #include <string>
 
 #include "app/mac/nsimage_cache.h"
@@ skipping 399 matching lines @@
     return NO;
   } else if (effect == NSViewAnimationFadeOutEffect) {
     return YES;
   }
 
   NOTREACHED();
   return YES;
 }
 
 + (void)registerUserPrefs:(PrefService*)prefs {
-  prefs->RegisterDoublePref(prefs::kBrowserActionContainerWidth, 0);
+  prefs->RegisterDoublePref(prefs::kBrowserActionContainerWidth,
+                            0,
+                            PrefService::UNSYNCABLE_PREF);
 }
 
 #pragma mark -
 #pragma mark Private Methods
 
 - (void)createButtons {
   if (!toolbarModel_)
     return;
 
   NSUInteger i = 0;
@@ skipping 424 matching lines @@
   if (profile_->IsOffTheRecord())
     index = toolbarModel_->IncognitoIndexToOriginal(index);
   if (index < toolbarModel_->size()) {
     const Extension* extension = toolbarModel_->GetExtensionByIndex(index);
     return [buttons_ objectForKey:base::SysUTF8ToNSString(extension->id())];
   }
   return nil;
 }
 
 @end