MD History: Simplify flex layout in <history-list>

chrome/browser/resources/md_history/history_toolbar.html

 <link rel="import" href="chrome://resources/html/polymer.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-icons/hardware-icons.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-icon-button/paper-icon-button.html">
 <link rel="import" href="chrome://resources/polymer/v1_0/paper-tabs/paper-tab.html">
 <link rel="import" href="chrome://resources/polymer/v1_0/paper-tabs/paper-tabs.html">
 <link rel="import" href="chrome://resources/cr_elements/icons.html">
 <link rel="import" href="chrome://resources/cr_elements/cr_toolbar/cr_toolbar.html">
 <link rel="import" href="chrome://history/icons.html">
 <link rel="import" href="chrome://history/shared_style.html">
 
 <dom-module id="history-toolbar">
   <template>
     <style include="shared-style">
       :host {
         color: #fff;
+        display: block;
         transition: background-color 150ms;
         width: 100%;
       }
 
       cr-toolbar,
       #overlay-buttons,
       #overlay-wrapper,
       #toolbar-container {
         @apply(--layout-center);
         @apply(--layout-horizontal);
         width: 100%;
       }
 
       :host([items-selected_]) {
         background: rgb(68, 136, 255);
       }
 
       #toolbar-container {
-        height: 56px;
+        height: var(--toolbar-height);
       }
 
       #overlay-buttons {
         margin: 0 auto;
         max-width: var(--card-max-width);
         padding: 0 var(--card-padding-side);
       }
 
       #overlay-wrapper {
         -webkit-margin-start: var(--side-bar-width);
@@ skipping 18 matching lines @@
       }
 
       paper-tab {
         --paper-tab-ink: rgba(255, 255, 255, 0.4);
         font-size: 13px;
         text-transform: uppercase;
       }
 
       paper-tabs {
         --paper-tabs-selection-bar-color: var(--google-blue-500);
-        height: 45px;
+        height: calc(var(--toolbar-grouped-height) - var(--toolbar-height));
         min-width: 300px;
       }
 
       #grouped-buttons-container {
         @apply(--layout-center);
         @apply(--layout-horizontal);
         -webkit-margin-start: var(--side-bar-width);
       }
 
       #grouped-range-buttons {
         -webkit-margin-start: 32px;
       }
 
       #grouped-nav-container {
         @apply(--layout-center);
         @apply(--layout-end-justified);
         @apply(--layout-flex);
         @apply(--layout-horizontal);
         -webkit-margin-end: 24px;
         overflow: hidden;
         transition: opacity 150ms;
       }
 
-      :host([grouped-range="0"]) #grouped-nav-container {
+      :host([grouped-range='0']) #grouped-nav-container {
         opacity: 0;
         pointer-events: none;
       }
 
       #grouped-date {
         flex: 0 1 auto;
         opacity: 0.7;
         overflow: hidden;
         text-align: right;
         text-overflow: ellipsis;
@@ skipping 43 matching lines @@
               class="rtl-reversible"></paper-icon-button>
           <paper-icon-button icon="cr:chevron-right"
               alt="$i18n{rangeNext}" title="$i18n{rangeNext}"
               class="rtl-reversible"></paper-icon-button>
         </div>
       </div>
     </template>
   </template>
   <script src="chrome://history/history_toolbar.js"></script>
 </dom-module>