Simplify the user agent overriding code, in preparation for moving it out of src/webkit.

webkit/common/user_agent/user_agent.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 WEBKIT_COMMON_USER_AGENT_USER_AGENT_H_
 #define WEBKIT_COMMON_USER_AGENT_USER_AGENT_H_
 
 #include <string>
 
 #include "base/basictypes.h"

[tfarina, 2014/03/07 00:15:06]

remove?

 #include "url/gurl.h"

[tfarina, 2014/03/07 00:15:06]

forward declare?

 #include "webkit/common/user_agent/webkit_user_agent_export.h"
 
 namespace webkit_glue {
 
-// Sets the user agent.  Pass true for overriding if this is a custom
-// user agent instead of the default one (in order to turn off any browser
-// sniffing workarounds). This must be called before GetUserAgent() can
+// Sets the user agent. This must be called before GetUserAgent() can
 // be called.
-WEBKIT_USER_AGENT_EXPORT void SetUserAgent(const std::string& user_agent,
-                                           bool overriding);
+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_