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

chrome/browser/resources/settings/appearance_page/appearance_page.html

 <link rel="import" href="chrome://resources/html/i18n_behavior.html">
 <link rel="import" href="chrome://resources/html/polymer.html">
 <link rel="import" href="chrome://resources/polymer/v1_0/iron-flex-layout/classes/iron-flex-layout.html">
 <link rel="import" href="chrome://resources/polymer/v1_0/iron-icon/iron-icon.html">
 <link rel="import" href="chrome://resources/polymer/v1_0/neon-animation/neon-animatable.html">
 <link rel="import" href="chrome://resources/polymer/v1_0/paper-button/paper-button.html">
 <link rel="import" href="chrome://resources/polymer/v1_0/paper-radio-button/paper-radio-button.html">
 <link rel="import" href="chrome://resources/polymer/v1_0/paper-toggle-button/paper-toggle-button.html">
 <link rel="import" href="/appearance_page/appearance_browser_proxy.html">
 <link rel="import" href="/controls/settings_dropdown_menu.html">
@@ skipping 67 matching lines @@
                 </settings-input>
               </paper-radio-button>
             </settings-radio-group>
           </div>
         </template>
         <div class="settings-box">
           <settings-checkbox class="start" label="$i18n{showBookmarksBar}"
               pref="{{prefs.bookmark_bar.show_on_all_tabs}}">
           </settings-checkbox>
         </div>
+<if expr="is_linux and not chromeos">
+        <div class="settings-box">
+          <settings-checkbox class="start" label="$i18n{showWindowDecorations}"
+              pref="{{prefs.browser.custom_chrome_frame}}">
+          </settings-checkbox>
+        </div>
+</if>
         <div class="settings-box">
           <div class="start">$i18n{fontSize}</div>
           <settings-dropdown-menu id="defaultFontSize"
               pref="{{prefs.webkit.webprefs.default_font_size}}"
               menu-options="[[fontSizeOptions_]]" no-label-float>
           </settings-dropdown-menu>
         </div>
         <div class="settings-box two-line" on-tap="onCustomizeFontsTap_"
             actionable>
           <div class="start">
@@ skipping 11 matching lines @@
       <template is="dom-if" name="appearance-fonts">
         <settings-subpage page-title="$i18n{customizeFonts}">
           <settings-appearance-fonts-page prefs="{{prefs}}">
           </settings-appearance-fonts-page>
         </settings-subpage>
       </template>
     </settings-animated-pages>
   </template>
   <script src="appearance_page.js"></script>
 </dom-module>