Fix uninitialized variable in PrefServiceSyncable class.

components/syncable_prefs/pref_service_syncable.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 "components/syncable_prefs/pref_service_syncable.h"
 
 #include "base/bind.h"
 #include "base/callback.h"
 #include "base/files/file_path.h"
 #include "base/strings/string_number_conversions.h"
@@ skipping 17 matching lines @@
     const PrefModelAssociatorClient* pref_model_associator_client,
     base::Callback<void(PersistentPrefStore::PrefReadError)>
         read_error_callback,
     bool async)
     : PrefService(pref_notifier,
                   pref_value_store,
                   user_prefs,
                   pref_registry,
                   read_error_callback,
                   async),
+      pref_service_forked_(false),
       pref_sync_associator_(pref_model_associator_client, syncer::PREFERENCES),
       priority_pref_sync_associator_(pref_model_associator_client,
                                      syncer::PRIORITY_PREFERENCES) {
   pref_sync_associator_.SetPrefService(this);
   priority_pref_sync_associator_.SetPrefService(this);
 
   // Let PrefModelAssociators know about changes to preference values.
   pref_value_store->set_callback(base::Bind(
       &PrefServiceSyncable::ProcessPrefChange, base::Unretained(this)));
 
@@ skipping 134 matching lines @@
   FOR_EACH_OBSERVER(PrefServiceSyncableObserver, observer_list_,
                     OnIsSyncingChanged());
 }
 
 void PrefServiceSyncable::ProcessPrefChange(const std::string& name) {
   pref_sync_associator_.ProcessPrefChange(name);
   priority_pref_sync_associator_.ProcessPrefChange(name);
 }
 
 }  // namespace syncable_prefs