Remove the enable_metro GYP flag, effectively making it on by default.

chrome/installer/mini_installer.gypi

 # 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.
 {
   'dependencies': [
     '<(chrome_dll_project)',
     '../chrome.gyp:chrome',
     '../chrome.gyp:chrome_nacl_win64',
     '../chrome.gyp:default_extensions',
     '../chrome.gyp:setup',
@@ skipping 28 matching lines @@
   'msvs_precompiled_header': '',
   'msvs_precompiled_source': '',
   'msvs_settings': {
     'VCCLCompilerTool': {
       'EnableIntrinsicFunctions': 'true',
       'BufferSecurityCheck': 'false',
       'BasicRuntimeChecks': '0',
       'ExceptionHandling': '0',
     },
     'VCLinkerTool': {
-      'OutputFile': '<(output_dir)/mini_installer.exe', 
+      'OutputFile': '<(output_dir)/mini_installer.exe',
       'ProgramDatabaseFile': '<(output_dir)/mini_installer.pdb',
       'MapFileName': '<(output_dir)/mini_installer.map',
       'RandomizedBaseAddress': '1',
       'DataExecutionPrevention': '0',
       'AdditionalLibraryDirectories': [
         '<(DEPTH)/third_party/platformsdk_win7/files/Lib',
         '<(PRODUCT_DIR)/lib'
       ],
       'DelayLoadDLLs': [],
       'EntryPointSymbol': 'MainEntryPoint',
@@ skipping 100 matching lines @@
       'conditions': [
         ['enable_hidpi == 1', {
           'variables': {
             'enable_hidpi_flag': '--enable_hidpi=1',
           },
         }, {
           'variables': {
             'enable_hidpi_flag': '',
           },
         }],
-        ['enable_metro == 1', {
+        ['enable_touch_ui == 1', {
           'variables': {
-            'enable_metro_flag': '--enable_metro=1',
+            'enable_touch_ui_flag': '--enable_touch_ui=1',
           },
         }, {
           'variables': {
-            'enable_metro_flag': '',
+            'enable_touch_ui_flag': '',
           },
         }],
       ],
       'inputs': [
         '<(create_installer_archive_py_path)',
         '<(PRODUCT_DIR)/chrome.exe',
         '<(chrome_dll_path)',
         '<(PRODUCT_DIR)/nacl64.exe',
         '<(PRODUCT_DIR)/ppGoogleNaClPluginChrome.dll',
         '<(PRODUCT_DIR)/nacl_irt_x86_32.nexe',
@@ skipping 10 matching lines @@
       ],
       'action': [
         'python',
         '<(create_installer_archive_py_path)',
         '--build_dir=<(PRODUCT_DIR)',
         '--output_dir=<(output_dir)',
         '--staging_dir=<(INTERMEDIATE_DIR)',
         '--input_file=<(RULE_INPUT_PATH)',
         '--resource_file_path=<(INTERMEDIATE_DIR)/packed_files.rc',
         '<(enable_hidpi_flag)',
-        '<(enable_metro_flag)',
+        '<(enable_touch_ui_flag)',
         # TODO(sgk):  may just use environment variables
         #'--distribution=$(CHROMIUM_BUILD)',
         '--distribution=_google_chrome',
         # Optional arguments to generate diff installer
         #'--last_chrome_installer=C:/Temp/base',
         #'--setup_exe_format=DIFF',
         #'--diff_algorithm=COURGETTE',
       ],
       'message': 'Create installer archive'
     },
   ],
   # TODO(mark):  <(branding_dir) should be defined by the
   # global condition block at the bottom of the file, but
   # this doesn't work due to the following issue:
   #
   #   http://code.google.com/p/gyp/issues/detail?id=22
   #
   # Remove this block once the above issue is fixed.
   'conditions': [
     [ 'branding == "Chrome"', {
       'variables': {
          'branding_dir': '../app/theme/google_chrome',
       },
     }, { # else branding!="Chrome"
       'variables': {
          'branding_dir': '../app/theme/chromium',
       },
     }],
   ],
-}
+}