[MD History] Move Clear Browsing Data button to sidebar.

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-max-width: 960px;
         --card-min-width: 500px;
         --card-padding-side: 24px;
         --first-card-padding-top: 40px;
-        --side-bar-width: 200px;
+        --side-bar-width: 256px;

[tsergeant, 2016/05/05 21:29:31]

I'm not sure if this is meant to be the new width for us -- bettes@ said that it
was *not* the width in the settings spec. We should clarify.

[calamity, 2016/05/10 03:15:26]

Resolved.

       }
 
       [hidden] {
         display: none !important;
       }
 
       .card-title {
         @apply(--layout-center);
         @apply(--layout-horizontal);
         -webkit-padding-start: 20px;
@@ skipping 29 matching lines @@
         text-overflow: ellipsis;
         white-space: nowrap;
       }
 
       .website-title:hover {
         text-decoration: underline;
       }
     </style>
   </template>
 </dom-module>