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

content/public/common/content_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 "content" command-line switches.
 
 #ifndef CONTENT_PUBLIC_COMMON_CONTENT_SWITCHES_H_
 #define CONTENT_PUBLIC_COMMON_CONTENT_SWITCHES_H_
 
 #include "build/build_config.h"
@@ skipping 238 matching lines @@
 CONTENT_EXPORT extern const char kTraceShutdown[];
 extern const char kTraceShutdownFile[];
 extern const char kTraceStartup[];
 extern const char kTraceStartupDuration[];
 extern const char kTraceStartupFile[];
 CONTENT_EXPORT extern const char kUIPrioritizeInGpuProcess[];
 CONTENT_EXPORT extern const char kUseDiscardableMemory[];
 CONTENT_EXPORT extern const char kUseFakeDeviceForMediaStream[];
 CONTENT_EXPORT extern const char kUseFakeUIForMediaStream[];
 CONTENT_EXPORT extern const char kUseMobileUserAgent[];
-CONTENT_EXPORT extern const char kUserAgent[];
 extern const char kUtilityCmdPrefix[];
 CONTENT_EXPORT extern const char kUtilityProcess[];
 extern const char kUtilityProcessAllowedDir[];
 CONTENT_EXPORT extern const char kUtilityProcessEnableMDns[];
 CONTENT_EXPORT extern const char kUtilityProcessRunningElevated[];
 CONTENT_EXPORT extern const char kValidateInputEventStream[];
 CONTENT_EXPORT extern const char kWaitForDebuggerChildren[];
 CONTENT_EXPORT extern const char kWebGLCommandBufferSizeKb[];
 CONTENT_EXPORT extern const char kWorkerProcess[];
 CONTENT_EXPORT extern const char kZygoteCmdPrefix[];
@@ skipping 42 matching lines @@
 #if defined(OS_POSIX)
 extern const char kChildCleanExit[];
 #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  // CONTENT_PUBLIC_COMMON_CONTENT_SWITCHES_H_