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

chrome/browser/resources/md_history/shared_style.html

 <dom-module id="shared-style">
   <template>
     <style>
       :root {
         --card-border-color: rgba(0, 0, 0, 0.14);
         --card-first-last-item-padding: 8px;
         --card-max-width: 960px;
         --card-min-width: 500px;
         --card-padding-between: 20px;
         --card-padding-side: 24px;
-        --first-card-padding-top: 40px;
+        --first-card-padding-top: 24px;
         --side-bar-width: 256px;
+        --toolbar-grouped-height: 101px;
+        --toolbar-height: 56px;

[calamity, 2016/06/21 08:18:00]

Changing these won't change the toolbar height or the grouped height. Seems
dodgy.

You can definitely lock these to the paper-tabs height and the
#toolbar-container height in some fashion.

[tsergeant, 2016/06/22 01:13:45]

Done.

       }
 
       [hidden] {
         display: none !important;
       }
 
       .card-title {
         @apply(--layout-center);
         @apply(--layout-horizontal);
         -webkit-padding-start: 20px;
         background: #fafafa;
         border-bottom: 1px solid var(--card-border-color);
         border-radius: 2px 2px 0 0;
         color: #333;
         font-size: 14px;
         font-weight: 500;
         height: 48px;
       }
 
       .centered-message {
         align-items: center;
         color: #b4b4b4;
         display: flex;
         flex: 1;
         font-size: 14px;
         font-weight: 500;
+        height: 100%;
         justify-content: center;
       }
 
       .website-icon {
         -webkit-margin-end: 16px;
         background-repeat: no-repeat;
         background-size: 16px;
         height: 16px;
         width: 16px;
       }
 
       .website-title {
         color: #333;
         overflow: hidden;
         text-decoration: none;
         text-overflow: ellipsis;
         white-space: nowrap;
       }
 
       .website-title:hover {
         text-decoration: underline;
       }
     </style>
   </template>
 </dom-module>