MD History: Add responsive layout which hides the sidebar in thin windows

chrome/browser/resources/settings/settings_ui/settings_ui.html

 <link rel="import" href="chrome://resources/cr_elements/cr_toolbar/cr_toolbar.html">
 <link rel="import" href="chrome://resources/cr_elements/icons.html">
 <link rel="import" href="chrome://resources/html/polymer.html">
 <link rel="import" href="chrome://resources/polymer/v1_0/app-layout/app-drawer/app-drawer.html">
 <link rel="import" href="chrome://resources/polymer/v1_0/iron-flex-layout/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/paper-header-panel/paper-header-panel.html">
-<link rel="import" href="chrome://resources/polymer/v1_0/paper-icon-button/paper-icon-button.html">
 <link rel="import" href="/direction_delegate.html">
 <link rel="import" href="/i18n_setup.html">
 <link rel="import" href="/icons.html">
 <link rel="import" href="/settings_main/settings_main.html">
 <link rel="import" href="/settings_menu/settings_menu.html">
 <link rel="import" href="/settings_page/settings_router.html">
 <link rel="import" href="/settings_shared_css.html">
 
 <dom-module id="settings-ui">
   <template>
@@ skipping 37 matching lines @@
 
       app-drawer .drawer-header {
         align-items: center;
         display: flex;
         font-size: 123.08%; /* go to 16px from 13px */
         min-height: 56px;
       }
 
       cr-toolbar {
         @apply(--layout-center);
-        --side-bar-width: 256px;
         background-color: var(--settings-title-bar-background-color);
         color: white;
         min-height: 56px;
       }
 
-      cr-toolbar,
-      paper-icon-button {
+      cr-toolbar {
         --iron-icon-fill-color: white;
       }
 
       app-drawer .drawer-header {
         -webkit-padding-start: 24px;
         border-bottom: var(--settings-separator-line);
       }
 
       app-drawer .drawer-content {
         height: calc(100% - 56px);
         overflow: auto;
       }
     </style>
     <settings-router current-route="{{currentRoute}}"
         current-route-titles="{{currentRouteTitles}}">
     </settings-router>
     <!-- TODO(dpapad): Remove "coming soon" string once crbug.com/608535 fully
       addressed -->
     <cr-toolbar page-name="$i18n{settings}"
         clear-label="$i18n{clearSearch}" search-prompt="$i18n{searchPrompt}
-        (coming soon!)">
-      <paper-icon-button icon="settings:menu" on-tap="onMenuButtonTap_">
-      </paper-icon-button>
+        (coming soon!)" on-cr-menu-tap="onMenuButtonTap_">
     </cr-toolbar>
     <app-drawer swipe-open>
       <div class="drawer-header">$i18n{settings}</div>
       <div class="drawer-content">
         <settings-menu current-route="{{currentRoute}}" id="sideNav">
         </settings-menu>
       </div>
     </app-drawer>
     <paper-header-panel mode="waterfall">
       <settings-main prefs="{{prefs}}" current-route="{{currentRoute}}">
       </settings-main>
     </paper-header-panel>
   </template>
   <script src="settings_ui.js"></script>
 </dom-module>