chrome: Cleanup class/struct forward declarations

chrome/browser/profiles/profile_impl_io_data.h

 // Copyright (c) 2012 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 CHROME_BROWSER_PROFILES_PROFILE_IMPL_IO_DATA_H_
 #define CHROME_BROWSER_PROFILES_PROFILE_IMPL_IO_DATA_H_
 
 #include "base/callback.h"
 #include "base/containers/hash_tables.h"
 #include "base/macros.h"
 #include "base/memory/ref_counted.h"
 #include "chrome/browser/custom_handlers/protocol_handler_registry.h"
 #include "chrome/browser/net/chrome_url_request_context_getter.h"
 #include "chrome/browser/profiles/profile_io_data.h"
 #include "components/prefs/pref_store.h"
 #include "content/public/browser/cookie_store_factory.h"
 
 class JsonPrefStore;
 
 namespace chrome_browser_net {
 class Predictor;
 }  // namespace chrome_browser_net
 
-namespace data_reduction_proxy {
-class DataReductionProxyNetworkDelegate;
-}  // namespace data_reduction_proxy
-
 namespace domain_reliability {
 class DomainReliabilityMonitor;
 }  // namespace domain_reliability
 
 namespace net {
 class CookieStore;
 class HttpServerPropertiesManager;
 class SdchOwner;
 }  // namespace net
 
@@ skipping 193 matching lines @@
 
   // Parameters needed for isolated apps.
   base::FilePath profile_path_;
   int app_cache_max_size_;
   int app_media_cache_max_size_;
 
   DISALLOW_COPY_AND_ASSIGN(ProfileImplIOData);
 };
 
 #endif  // CHROME_BROWSER_PROFILES_PROFILE_IMPL_IO_DATA_H_