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

chrome/common/chrome_switches.cc

 // 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.
 
 #include "chrome/common/chrome_switches.h"
 
 #include "base/base_switches.h"
 #include "base/command_line.h"
 
 namespace switches {
@@ skipping 1443 matching lines @@
 const char kUnlimitedStorage[]              = "unlimited-storage";
 
 // Uses Spdy for the transport protocol instead of HTTP. This is a temporary
 // testing flag.
 const char kUseSpdy[]                       = "use-spdy";
 
 // Disables use of the spelling web service and only provides suggestions.
 // This will only work if asynchronous spell checking is not disabled.
 const char kUseSpellingSuggestions[]        = "use-spelling-suggestions";
 
+// A string used to override the default user agent with a custom one.
+const char kUserAgent[]                     = "user-agent";
+
 // Specifies the user data directory, which is where the browser will look for
 // all of its state.
 const char kUserDataDir[]                   = "user-data-dir";
 
 // Examines a .crx for validity and prints the result.
 const char kValidateCrx[]                   = "validate-crx";
 
 // Uses experimental simple cache backend if possible.
 const char kUseSimpleCacheBackend[]         = "use-simple-cache-backend";
 
@@ skipping 172 matching lines @@
 
 // -----------------------------------------------------------------------------
 // DO NOT ADD YOUR CRAP TO THE BOTTOM OF THIS FILE.
 //
 // You were going to just dump your switches here, weren't you? Instead, please
 // put them in alphabetical order above, or in order inside the appropriate
 // ifdef at the bottom. The order should match the header.
 // -----------------------------------------------------------------------------
 
 }  // namespace switches