components: Cleanup class/struct fwd declarations

components/data_reduction_proxy/core/browser/data_reduction_proxy_service.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_SERVICE_H_
 #define COMPONENTS_DATA_REDUCTION_PROXY_CORE_BROWSER_DATA_REDUCTION_PROXY_SERVICE_H_
 
 #include <stdint.h>
 
 #include <memory>
 #include <string>
 
 #include "base/callback.h"
 #include "base/gtest_prod_util.h"
 #include "base/macros.h"
 #include "base/memory/ref_counted.h"
 #include "base/memory/weak_ptr.h"
 #include "base/observer_list.h"
 #include "base/threading/non_thread_safe.h"
 #include "components/data_reduction_proxy/core/browser/data_reduction_proxy_metrics.h"
 #include "components/data_reduction_proxy/core/browser/db_data_owner.h"
 #include "components/data_reduction_proxy/core/common/data_reduction_proxy_event_storage_delegate.h"
 
-class GURL;
 class PrefService;
 
 namespace base {
 class SequencedTaskRunner;
 class SingleThreadTaskRunner;
 class TimeDelta;
 class Value;
 }
 
 namespace net {
@@ skipping 166 matching lines @@
   bool initialized_;
 
   base::WeakPtrFactory<DataReductionProxyService> weak_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(DataReductionProxyService);
 };
 
 }  // namespace data_reduction_proxy
 
 #endif  // COMPONENTS_DATA_REDUCTION_PROXY_CORE_BROWSER_DATA_REDUCTION_PROXY_SERVICE_H_