Add --enable-show-modal-dialog to chrome

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 157 matching lines @@
 extern const char kEnableQuicPortSelection[];
 extern const char kEnableQuicTimeBasedLossDetection[];
 extern const char kEnableResourceContentSettings[];
 extern const char kEnableSavePasswordBubble[];
 extern const char kEnableSdchOverHttps[];
 extern const char kEnableSearchButtonInOmniboxAlways[];
 extern const char kEnableSearchButtonInOmniboxForStr[];
 extern const char kEnableSearchButtonInOmniboxForStrOrIip[];
 extern const char kEnableSessionCrashedBubble[];
 extern const char kEnableSettingsWindow[];
+extern const char kEnableShowModalDialog[];
 extern const char kDisableSettingsWindow[];
 extern const char kEnableSpdy4[];
 extern const char kEnableSpellingAutoCorrect[];
 extern const char kEnableSpellingFeedbackFieldTrial[];
 extern const char kEnableStreamlinedHostedApps[];
 extern const char kEnableSuggestionsService[];
 extern const char kEnableSyncArticles[];
 extern const char kEnableSyncSyncedNotifications[];
 extern const char kEnableThumbnailRetargeting[];
 extern const char kEnableTranslateNewUX[];
@@ skipping 218 matching lines @@
 #endif
 
 bool SettingsWindowEnabled();
 
 // 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_