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

chrome/common/chrome_switches.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.
 
 // Defines all the command-line switches used by Chrome.
 
 #ifndef CHROME_COMMON_CHROME_SWITCHES_H_
 #define CHROME_COMMON_CHROME_SWITCHES_H_
 
 #include "build/build_config.h"
@@ skipping 378 matching lines @@
 extern const char kTestType[];
 extern const char kTestingChannelID[];
 extern const char kTrustedSpdyProxy[];
 extern const char kTryChromeAgain[];
 extern const char kUninstallExtension[];
 extern const char kUninstall[];
 extern const char kUnlimitedStorage[];
 extern const char kUseSimpleCacheBackend[];
 extern const char kUseSpdy[];
 extern const char kUseSpellingSuggestions[];
+extern const char kUserAgent[];
 extern const char kUserDataDir[];
 extern const char kValidateCrx[];
 extern const char kVariationsServerURL[];
 extern const char kVersion[];
 extern const char kWhitelistedExtensionID[];
 extern const char kWindowPosition[];
 extern const char kWindowSize[];
 extern const char kWinHttpProxyResolver[];
 
 #if defined(ENABLE_PLUGIN_INSTALLATION)
@@ skipping 61 matching lines @@
 #else
 extern const char kEnablePrintPreview[];
 #endif
 
 // DON'T ADD RANDOM STUFF HERE. Put it in the main section above in
 // alphabetical order, or in one of the ifdefs (also in order in each section).
 
 }  // namespace switches
 
 #endif  // CHROME_COMMON_CHROME_SWITCHES_H_