components: Cleanup class/struct fwd declarations

components/cronet/ios/cronet_environment.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 COMPONENTS_CRONET_IOS_CRONET_ENVIRONMENT_H_
 #define COMPONENTS_CRONET_IOS_CRONET_ENVIRONMENT_H_
 
 #include <list>
 #include <string>
 #include <vector>
@@ skipping 10 matching lines @@
 #include "net/url_request/url_request_context_getter.h"
 
 class JsonPrefStore;
 
 namespace base {
 class WaitableEvent;
 }  // namespace base
 
 namespace net {
 class CookieStore;
-class HttpCache;
-class NetworkChangeNotifier;
 class NetLog;
 class ProxyConfigService;
 class WriteToFileNetLogObserver;
 }  // namespace net
 
 namespace cronet {
 // CronetEnvironment contains all the network stack configuration
 // and initialization.
 class CronetEnvironment {
  public:
@@ skipping 103 matching lines @@
   bool user_agent_partial_;
   std::unique_ptr<net::NetLog> net_log_;
   std::unique_ptr<net::WriteToFileNetLogObserver> net_log_observer_;
 
   DISALLOW_COPY_AND_ASSIGN(CronetEnvironment);
 };
 
 }  // namespace cronet
 
 #endif  // COMPONENTS_CRONET_IOS_CRONET_ENVIRONMENT_H_