services: Cleanup class/struct fwd declarations

services/preferences/public/cpp/pref_observer_store.h

 // Copyright 2016 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.
 
 #ifndef SERVICES_PREFERENCES_PUBLIC_CPP_PREFS_OBSERVER_STORE_H_
 #define SERVICES_PREFERENCES_PUBLIC_CPP_PREFS_OBSERVER_STORE_H_
 
 #include <set>
 
 #include "base/macros.h"
 #include "components/prefs/value_map_pref_store.h"
 #include "mojo/common/common_custom_types.mojom.h"
 #include "mojo/public/cpp/bindings/binding.h"
 #include "services/preferences/public/interfaces/preferences.mojom.h"
 
-namespace shell {
-class Connector;
-}
-
 class PrefObserverStoreTest;
 
 // An implementation of PrefStore which uses prefs::mojom::PreferenceManager as
 // the backing of the preferences.
 //
 // PrefObserverStore caches the values locally to provide synchronous access.
 // The cache is empty until the first notification of OnPreferencesChanged is
 // received from the prefs::mojom::PreferenceManager. Upon recieving an initial
 // OnPreferencesChanged initialization will be considered as completed, and any
 // PrefStore::Observer will be notified of OnInitializationCompleted.
@@ skipping 43 matching lines @@
 
   std::set<std::string> keys_;
 
   // True upon the first OnPreferencesChanged received after Init.
   bool initialized_;
 
   DISALLOW_COPY_AND_ASSIGN(PrefObserverStore);
 };
 
 #endif  // SERVICES_PREFERENCES_PUBLIC_CPP_PREFS_OBSERVER_STORE_H_