components: Cleanup class/struct fwd declarations

components/spellcheck/browser/spelling_service_client.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 COMPONENTS_SPELLCHECK_BROWSER_SPELLING_SERVICE_CLIENT_H_
 #define COMPONENTS_SPELLCHECK_BROWSER_SPELLING_SERVICE_CLIENT_H_
 
 #include <map>
 #include <memory>
 #include <string>
 #include <vector>
 
 #include "base/callback.h"
 #include "base/compiler_specific.h"
 #include "base/strings/string16.h"
 #include "net/url_request/url_fetcher_delegate.h"
 
 class GURL;
-class TextCheckClientDelegate;
 struct SpellCheckResult;
 
 namespace content {
 class BrowserContext;
 }
 
 namespace net {
 class URLFetcher;
 }  // namespace net
 
@@ skipping 90 matching lines @@
   // function is overridden by unit tests to prevent them from actually sending
   // requests to the Spelling service.
   virtual std::unique_ptr<net::URLFetcher> CreateURLFetcher(const GURL& url);
 
   // The URLFetcher object used for sending a JSON-RPC request.
   std::map<const net::URLFetcher*, std::unique_ptr<TextCheckCallbackData>>
       spellcheck_fetchers_;
 };
 
 #endif  // COMPONENTS_SPELLCHECK_BROWSER_SPELLING_SERVICE_CLIENT_H_