Add cross-platform API to get the form factor of the device

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 406 matching lines @@
 extern const char kEnableSpdyProxyAuth[];
 #endif  // defined(OS_ANDROID) || defined(OS_IOS)
 
 #if defined(OS_ANDROID)
 extern const char kDisableAddToHomescreen[];
 extern const char kDisableNewNTP[];
 extern const char kEnableAccessibilityTabSwitcher[];
 extern const char kEnableAddToHomescreen[];
 extern const char kEnableNewNTP[];
 extern const char kEnableTranslate[];
-extern const char kTabletUI[];
 extern const char kEnableCast[];
 #endif
 
 #if defined(USE_ASH)
 extern const char kOpenAsh[];
 #endif
 
 #if defined(OS_POSIX)
 extern const char kEnableCrashReporterForTesting[];
 #if !defined(OS_MACOSX) && !defined(OS_CHROMEOS)
@@ skipping 39 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_