Refactor preference syncing.

chrome/browser/web_resource/gpu_blacklist_updater.cc

Index: chrome/browser/web_resource/gpu_blacklist_updater.cc
diff --git a/chrome/browser/web_resource/gpu_blacklist_updater.cc b/chrome/browser/web_resource/gpu_blacklist_updater.cc
index 5f31e4d76a97db56e64603818c7dd84846558f92..b660a3672a7eeb2d2806fe3acda05ca01a5dc553 100644
--- a/chrome/browser/web_resource/gpu_blacklist_updater.cc
+++ b/chrome/browser/web_resource/gpu_blacklist_updater.cc
@@ -47,9 +47,10 @@ GpuBlacklistUpdater::GpuBlacklistUpdater()
   // If we bring up chrome normally, prefs should never be NULL; however, we
   // we handle the case where local_state == NULL for certain tests.
   if (local_state) {
-    local_state->RegisterDictionaryPref(prefs::kGpuBlacklist);
+    local_state->RegisterDictionaryPref(prefs::kGpuBlacklist,
+                                        false /* don't sync pref */);
     gpu_blacklist_cache_ = local_state->GetDictionary(prefs::kGpuBlacklist);
-    DCHECK(gpu_blacklist_cache_);   
+    DCHECK(gpu_blacklist_cache_);
   }
 
   LoadGpuBlacklist();