Remove obviously unneeded forward declarations from headers under src/{app,base,net}.

net/http/http_auth_controller.h

 // Copyright (c) 2010 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 NET_HTTP_HTTP_AUTH_CONTROLLER_H_
 #define NET_HTTP_HTTP_AUTH_CONTROLLER_H_
 #pragma once
 
 #include <set>
 #include <string>
 
 #include "base/basictypes.h"
 #include "base/ref_counted.h"
 #include "base/scoped_ptr.h"
 #include "base/string16.h"
 #include "googleurl/src/gurl.h"
 #include "net/base/completion_callback.h"
 #include "net/base/net_log.h"
 #include "net/http/http_auth.h"
 
 namespace net {
 
 class AuthChallengeInfo;
-class HostResolver;
 class HttpAuthHandler;
 class HttpNetworkSession;
 class HttpRequestHeaders;
 struct HttpRequestInfo;
 
 class HttpAuthController : public base::RefCounted<HttpAuthController> {
  public:
   // The arguments are self explanatory except possibly for |auth_url|, which
   // should be both the auth target and auth path in a single url argument.
   HttpAuthController(HttpAuth::Target target, const GURL& auth_url,
@@ skipping 105 matching lines @@
 
   std::set<std::string> disabled_schemes_;
 
   CompletionCallbackImpl<HttpAuthController> io_callback_;
   CompletionCallback* user_callback_;
 };
 
 }  // namespace net
 
 #endif  // NET_HTTP_HTTP_AUTH_CONTROLLER_H_