revert r71405 as it is causing ui test failures:

chrome/common/chrome_switches.h

 // Copyright (c) 2010 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_
 #pragma once
 
@@ skipping 226 matching lines @@
 extern const char kMediaCacheSize[];
 extern const char kMemoryProfiling[];
 extern const char kMessageLoopHistogrammer[];
 extern const char kMetricsRecordingOnly[];
 extern const char kMinClearSiteDataFlashVersion[];
 extern const char kNaClDebugIP[];
 extern const char kNaClDebugPorts[];
 extern const char kNaClBrokerProcess[];
 extern const char kNaClLoaderProcess[];
 extern const char kNaClStartupDialog[];
+extern const char kNewChromeUISecurityModel[];
 extern const char kNoDefaultBrowserCheck[];
 extern const char kNoEvents[];
 extern const char kNoExperiments[];
 extern const char kNoFirstRun[];
 extern const char kNoGpuSandbox[];
 extern const char kNoJsRandomness[];
 extern const char kNoProxyServer[];
 extern const char kNoReferrers[];
 extern const char kNoPings[];
 extern const char kNoSandbox[];
@@ skipping 159 matching lines @@
 
 // Return true if the switches indicate the seccomp sandbox is enabled.
 bool SeccompSandboxEnabled();
 
 // 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_