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

chrome/browser/chrome_content_browser_client.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/browser/chrome_content_browser_client.h"
 
 #include <set>
 #include <utility>
 #include <vector>
 
@@ skipping 1456 matching lines @@
 #endif  // OS_POSIX
 
   if (logging::DialogsAreSuppressed())
     command_line->AppendSwitch(switches::kNoErrorDialogs);
 
   std::string process_type =
       command_line->GetSwitchValueASCII(switches::kProcessType);
   const CommandLine& browser_command_line = *CommandLine::ForCurrentProcess();
 
   static const char* const kCommonSwitchNames[] = {
+    switches::kUserAgent,
     switches::kUserDataDir,  // Make logs go to the right file.
   };
   command_line->CopySwitchesFrom(browser_command_line, kCommonSwitchNames,
                                  arraysize(kCommonSwitchNames));
 
 #if defined(ENABLE_IPC_FUZZER)
   static const char* const kIpcFuzzerSwitches[] = {
     switches::kIpcFuzzerTestcase,
   };
   command_line->CopySwitchesFrom(browser_command_line, kIpcFuzzerSwitches,
@@ skipping 1244 matching lines @@
       switches::kDisableWebRtcEncryption,
     };
     to_command_line->CopySwitchesFrom(from_command_line,
                                       kWebRtcDevSwitchNames,
                                       arraysize(kWebRtcDevSwitchNames));
   }
 }
 #endif  // defined(ENABLE_WEBRTC)
 
 }  // namespace chrome