components: Cleanup class/struct fwd declarations

components/data_reduction_proxy/core/browser/data_reduction_proxy_config.h

 // Copyright 2015 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_CONFIG_H_
 #define COMPONENTS_DATA_REDUCTION_PROXY_CORE_BROWSER_DATA_REDUCTION_PROXY_CONFIG_H_
 
 #include <stdint.h>
 
 #include <memory>
@@ skipping 16 matching lines @@
 #include "net/proxy/proxy_config.h"
 #include "net/proxy/proxy_retry_info.h"
 
 class GURL;
 
 namespace base {
 class SingleThreadTaskRunner;
 }
 
 namespace net {
-class HostPortPair;
 class NetLog;
 class ProxyServer;
-class URLFetcher;
 class URLRequest;
 class URLRequestContextGetter;
 class URLRequestStatus;
 }
 
 namespace data_reduction_proxy {
 
 typedef base::Callback<void(const std::string&,
                             const net::URLRequestStatus&,
                             int)> FetcherResponseCallback;
 
 class DataReductionProxyConfigValues;
 class DataReductionProxyConfigurator;
 class DataReductionProxyEventCreator;
-class DataReductionProxyService;
 class SecureProxyChecker;
 struct DataReductionProxyTypeInfo;
 
 // Values of the UMA DataReductionProxy.ProbeURL histogram.
 // This enum must remain synchronized with
 // DataReductionProxyProbeURLFetchResult in metrics/histograms/histograms.xml.
 enum SecureProxyCheckFetchResult {
   // The secure proxy check failed because the Internet was disconnected.
   INTERNET_DISCONNECTED = 0,
 
@@ skipping 323 matching lines @@
   std::vector<base::TimeDelta> lofi_accuracy_recording_intervals_;
 
   base::WeakPtrFactory<DataReductionProxyConfig> weak_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(DataReductionProxyConfig);
 };
 
 }  // namespace data_reduction_proxy
 
 #endif  // COMPONENTS_DATA_REDUCTION_PROXY_CORE_BROWSER_DATA_REDUCTION_PROXY_CONFIG_H_