components: Cleanup class/struct fwd declarations

components/ntp_snippets/remote/ntp_snippets_fetcher.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_NTP_SNIPPETS_REMOTE_NTP_SNIPPETS_FETCHER_H_
 #define COMPONENTS_NTP_SNIPPETS_REMOTE_NTP_SNIPPETS_FETCHER_H_
 
 #include <memory>
 #include <set>
 #include <string>
@@ skipping 11 matching lines @@
 #include "components/ntp_snippets/remote/request_throttler.h"
 #include "components/translate/core/browser/language_model.h"
 #include "google_apis/gaia/oauth2_token_service.h"
 #include "net/url_request/url_fetcher_delegate.h"
 #include "net/url_request/url_request_context_getter.h"
 
 class PrefService;
 class SigninManagerBase;
 
 namespace base {
-class ListValue;
 class Value;
 }  // namespace base
 
 namespace ntp_snippets {
 
 class UserClassifier;
 
 // TODO(tschumann): BuildArticleCategoryInfo() and BuildRemoteCategoryInfo()
 // don't really belong into this library. However, as the snippets fetcher is
 // providing this data for server-defined remote sections it's a good starting
@@ skipping 257 matching lines @@
   std::string last_status_;
   std::string last_fetch_json_;
 
   base::WeakPtrFactory<NTPSnippetsFetcher> weak_ptr_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(NTPSnippetsFetcher);
 };
 }  // namespace ntp_snippets
 
 #endif  // COMPONENTS_NTP_SNIPPETS_REMOTE_NTP_SNIPPETS_FETCHER_H_