Continue to clean c_str() calls.

components/sync_preferences/synced_pref_change_registrar.cc

 // Copyright 2013 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/sync_preferences/synced_pref_change_registrar.h"
 
 #include "base/bind.h"
 
 namespace sync_preferences {
 
@@ skipping 41 matching lines @@
   }
   observers_.clear();
 }
 
 bool SyncedPrefChangeRegistrar::IsObserved(const char* path) const {
   return observers_.find(path) != observers_.end();
 }
 
 void SyncedPrefChangeRegistrar::OnSyncedPrefChanged(const std::string& path,
                                                     bool from_sync) {
-  if (pref_service_->IsManagedPreference(path.c_str()))
+  if (pref_service_->IsManagedPreference(path))
     return;
   ObserverMap::const_iterator iter = observers_.find(path);
   if (iter == observers_.end())
     return;
   iter->second.Run(path, from_sync);
 }
 
 }  // namespace sync_preferences