[Sync] Fix favicon updates to handle orphan nodes

sync/internal_api/sync_manager_impl.cc

 // Copyright (c) 2012 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 "sync/internal_api/sync_manager_impl.h"
 
 #include <string>
 
 #include "base/base64.h"
 #include "base/bind.h"
@@ skipping 104 matching lines @@
     // its own wait time logic for nudge.
     CUSTOM,
   };
 
   static NudgeDelayStrategy GetNudgeDelayStrategy(const ModelType& type) {
     switch (type) {
      case AUTOFILL:
        return ACCOMPANY_ONLY;
      case PREFERENCES:
      case SESSIONS:
+     case FAVICON_IMAGES:
+     case FAVICON_TRACKING:
        return CUSTOM;
      default:
        return IMMEDIATE;
     }
   }
 
   static TimeDelta GetNudgeDelayTimeDeltaFromType(
       const NudgeDelayStrategy& delay_type, const ModelType& model_type,
       const SyncManagerImpl* core) {
     CHECK(core);
     TimeDelta delay = TimeDelta::FromMilliseconds(
        kDefaultNudgeDelayMilliseconds);
     switch (delay_type) {
      case IMMEDIATE:
        delay = TimeDelta::FromMilliseconds(
            kDefaultNudgeDelayMilliseconds);
        break;
      case ACCOMPANY_ONLY:
        delay = TimeDelta::FromSeconds(kDefaultShortPollIntervalSeconds);
        break;
      case CUSTOM:
        switch (model_type) {
          case PREFERENCES:
            delay = TimeDelta::FromMilliseconds(
                kPreferencesNudgeDelayMilliseconds);
            break;
          case SESSIONS:
+         case FAVICON_IMAGES:
+         case FAVICON_TRACKING:
            delay = core->scheduler()->GetSessionsCommitDelay();
            break;
          default:
            NOTREACHED();
        }
        break;
      default:
        NOTREACHED();
     }
     return delay;
@@ skipping 1234 matching lines @@
 int SyncManagerImpl::GetDefaultNudgeDelay() {
   return kDefaultNudgeDelayMilliseconds;
 }
 
 // static.
 int SyncManagerImpl::GetPreferencesNudgeDelay() {
   return kPreferencesNudgeDelayMilliseconds;
 }
 
 }  // namespace syncer