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

net/http/http_auth_gssapi_posix.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_GSSAPI_POSIX_H_
 #define NET_HTTP_HTTP_AUTH_GSSAPI_POSIX_H_
 #pragma once
 
 #include <string>
 
 #include "base/gtest_prod_util.h"
 #include "base/native_library.h"
 #include "base/string16.h"
 #include "net/http/http_auth.h"
 
 #define GSS_USE_FUNCTION_POINTERS
 #include "net/third_party/gssapi/gssapi.h"
 
-class GURL;
-
 namespace net {
 
-struct HttpRequestInfo;
-
 extern gss_OID CHROME_GSS_C_NT_HOSTBASED_SERVICE_X;
 extern gss_OID CHROME_GSS_C_NT_HOSTBASED_SERVICE;
 extern gss_OID CHROME_GSS_KRB5_MECH_OID_DESC;
 
 // GSSAPILibrary is introduced so unit tests can mock the calls to the GSSAPI
 // library. The default implementation attempts to load one of the standard
 // GSSAPI library implementations, then simply passes the arguments on to
 // that implementation.
 class GSSAPILibrary {
  public:
@@ skipping 221 matching lines @@
   string16 password_;
   gss_OID gss_oid_;
   GSSAPILibrary* library_;
   std::string decoded_server_auth_token_;
   ScopedSecurityContext scoped_sec_context_;
 };
 
 }  // namespace net
 
 #endif  // NET_HTTP_HTTP_AUTH_GSSAPI_POSIX_H_