Simplify the user agent code some more since after r255534 it's not affected by the site's URL.

webkit/common/user_agent/user_agent.h

Index: webkit/common/user_agent/user_agent.h
===================================================================
--- webkit/common/user_agent/user_agent.h	(revision 255867)
+++ webkit/common/user_agent/user_agent.h	(working copy)
@@ -1,26 +0,0 @@
-// 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 WEBKIT_COMMON_USER_AGENT_USER_AGENT_H_
-#define WEBKIT_COMMON_USER_AGENT_USER_AGENT_H_
-
-#include <string>
-
-#include "webkit/common/user_agent/webkit_user_agent_export.h"
-
-class GURL;
-
-namespace webkit_glue {
-
-// Sets the user agent. This must be called before GetUserAgent() can
-// be called.
-WEBKIT_USER_AGENT_EXPORT void SetUserAgent(const std::string& user_agent);
-
-// Returns the user agent to use for the given URL. SetUserAgent() must
-// be called prior to calling this function.
-WEBKIT_USER_AGENT_EXPORT const std::string& GetUserAgent(const GURL& url);
-
-}  // namespace webkit_glue
-
-#endif  // WEBKIT_COMMON_USER_AGENT_USER_AGENT_H_