MD Settings: add "Use system title bar and borders"

chrome/common/pref_names.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/common/pref_names.h"
 
 #include "base/macros.h"
 #include "build/build_config.h"
 #include "chrome/common/pref_font_webkit_names.h"
 
@@ skipping 1022 matching lines @@
     "browser.default_browser_setting_enabled";
 
 #if defined(OS_MACOSX)
 // Boolean that indicates whether the application should show the info bar
 // asking the user to set up automatic updates when Keystone promotion is
 // required.
 const char kShowUpdatePromotionInfoBar[] =
     "browser.show_update_promotion_info_bar";
 #endif
 
+#if defined(OS_LINUX) && !defined(OS_CHROMEOS)
 // Boolean that is false if we should show window manager decorations.  If
 // true, we draw a custom chrome frame (thicker title bar and blue border).
 const char kUseCustomChromeFrame[] = "browser.custom_chrome_frame";
+#endif
 
 const char kBackShortcutBubbleShownCount[] =
     "browser.back_shortcut_bubble_shown_count";
 
 #if defined(ENABLE_PLUGINS)
 // Which plugins have been whitelisted manually by the user.
 const char kContentSettingsPluginWhitelist[] =
     "profile.content_settings.plugin_whitelist";
 #endif
 
@@ skipping 1200 matching lines @@
 #endif
 
 // The base64-encoded representation of the public key to use to validate origin
 // trial token signatures.
 const char kOriginTrialPublicKey[] = "origin_trials.public_key";
 
 // A list of origin trial features to disable by policy.
 const char kOriginTrialDisabledFeatures[] = "origin_trials.disabled_features";
 
 }  // namespace prefs