Refactor preference syncing.

content/browser/host_zoom_map.cc

 // 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.
 
 #include <cmath>
 
 #include "content/browser/host_zoom_map.h"
 
 #include "base/string_piece.h"
 #include "base/utf_string_conversions.h"
@@ skipping 54 matching lines @@
       bool success = host_zoom_dictionary->GetDoubleWithoutPathExpansion(
           host, &zoom_level);
       DCHECK(success);
       host_zoom_levels_[host] = zoom_level;
     }
   }
 }
 
 // static
 void HostZoomMap::RegisterUserPrefs(PrefService* prefs) {
-  prefs->RegisterDoublePref(prefs::kDefaultZoomLevel, 0.0);
-  prefs->RegisterDictionaryPref(prefs::kPerHostZoomLevels);
+  prefs->RegisterDoublePref(prefs::kDefaultZoomLevel,
+                            0.0,
+                            PrefService::UNSYNCABLE_PREF);
+  prefs->RegisterDictionaryPref(prefs::kPerHostZoomLevels,
+                                PrefService::UNSYNCABLE_PREF);
 }
 
 double HostZoomMap::GetZoomLevel(const GURL& url) const {
   std::string host(net::GetHostOrSpecFromURL(url));
   base::AutoLock auto_lock(lock_);
   HostZoomLevels::const_iterator i(host_zoom_levels_.find(host));
   return (i == host_zoom_levels_.end()) ? default_zoom_level_ : i->second;
 }
 
 void HostZoomMap::SetZoomLevel(const GURL& url, double level) {
@@ skipping 132 matching lines @@
       break;
     }
     default:
       NOTREACHED() << "Unexpected preference observed.";
   }
 }
 
 HostZoomMap::~HostZoomMap() {
   Shutdown();
 }