components: Cleanup class/struct fwd declarations

components/data_reduction_proxy/core/browser/data_reduction_proxy_network_delegate.h

 // Copyright 2014 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_DATA_REDUCTION_PROXY_CORE_BROWSER_DATA_REDUCTION_PROXY_NETWORK_DELEGATE_H_
 #define COMPONENTS_DATA_REDUCTION_PROXY_CORE_BROWSER_DATA_REDUCTION_PROXY_NETWORK_DELEGATE_H_
 
 #include <stdint.h>
 
 #include <memory>
 #include <string>
 
 #include "base/gtest_prod_util.h"
 #include "base/macros.h"
 #include "base/memory/ref_counted.h"
 #include "components/data_reduction_proxy/core/browser/data_reduction_proxy_metrics.h"
 #include "net/base/completion_callback.h"
 #include "net/base/layered_network_delegate.h"
 #include "net/proxy/proxy_retry_info.h"
 
 class GURL;
 
 namespace base {
 class Value;
 }
 
 namespace net {
-class HttpResponseHeaders;
 class HttpRequestHeaders;
 class NetworkDelegate;
 class ProxyConfig;
 class ProxyInfo;
-class ProxyServer;
-class ProxyService;
 class URLRequest;
 }
 
 namespace data_reduction_proxy {
 class DataReductionProxyBypassStats;
 class DataReductionProxyConfig;
 class DataReductionProxyConfigurator;
-class DataReductionProxyExperimentsStats;
 class DataReductionProxyIOData;
 class DataReductionProxyRequestOptions;
 class DataUseGroupProvider;
 class DataUseGroup;
 
 // Values of the UMA DataReductionProxy.LoFi.TransformationType histogram.
 // This enum must remain synchronized with
 // DataReductionProxyLoFiTransformationType in
 // metrics/histograms/histograms.xml.
 enum LitePageTransformationType {
@@ skipping 120 matching lines @@
 
   const DataReductionProxyConfigurator* configurator_;
 
   std::unique_ptr<DataUseGroupProvider> data_use_group_provider_;
 
   DISALLOW_COPY_AND_ASSIGN(DataReductionProxyNetworkDelegate);
 };
 }  // namespace data_reduction_proxy
 
 #endif  // COMPONENTS_DATA_REDUCTION_PROXY_CORE_BROWSER_DATA_REDUCTION_PROXY_NETWORK_DELEGATE_H_