Cleanup: Remove unneeded forward declarations from chrome/browser/extensions.

chrome/browser/extensions/extension_webrequest_api.h

 // Copyright (c) 2011 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_EXTENSIONS_EXTENSION_WEBREQUEST_API_H_
 #define CHROME_BROWSER_EXTENSIONS_EXTENSION_WEBREQUEST_API_H_
 #pragma once
 
+#include <list>
 #include <map>
 #include <set>
 #include <string>
 #include <vector>
 
 #include "base/memory/singleton.h"
 #include "base/time.h"
 #include "chrome/browser/extensions/extension_function.h"
 #include "chrome/browser/profiles/profile.h"
 #include "chrome/common/extensions/url_pattern_set.h"
 #include "ipc/ipc_message.h"
 #include "net/base/completion_callback.h"
 #include "net/base/network_delegate.h"
 #include "net/http/http_request_headers.h"
 #include "webkit/glue/resource_type.h"
 
 class ExtensionInfoMap;
 class ExtensionWebRequestTimeTracker;
 class GURL;
 class RenderProcessHost;
 
 namespace base {
 class DictionaryValue;
 class ListValue;
-class StringValue;
-}
-
-namespace extension_webrequest_api_helpers {
-struct EventResponseDelta;
 }
 
 namespace net {
 class AuthCredentials;
 class AuthChallengeInfo;
-class HostPortPair;
 class HttpRequestHeaders;
 class HttpResponseHeaders;
 class URLRequest;
 }
 
 // This class observes network events and routes them to the appropriate
 // extensions listening to those events. All methods must be called on the IO
 // thread unless otherwise specified.
 class ExtensionWebRequestEventRouter {
  public:
@@ skipping 313 matching lines @@
   // function.
   virtual void OnQuotaExceeded() OVERRIDE;
 };
 
 // Send updates to |host| with information about what webRequest-related
 // extensions are installed.
 // TODO(mpcomplete): remove. http://crbug.com/100411
 void SendExtensionWebRequestStatusToHost(RenderProcessHost* host);
 
 #endif  // CHROME_BROWSER_EXTENSIONS_EXTENSION_WEBREQUEST_API_H_