MD History: UI polish pass

chrome/browser/resources/md_history/side_bar.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-selector/iron-selector.html">
 <link rel="import" href="chrome://resources/polymer/v1_0/paper-styles/color.html">
 <link rel="import" href="chrome://resources/polymer/v1_0/paper-styles/typography.html">
 <link rel="import" href="chrome://history/browser_service.html">
 <link rel="import" href="chrome://history/shared_style.html">
 
 <dom-module id="history-side-bar">
   <template>
@@ skipping 70 matching lines @@
 
       :host([drawer]) #footer {
         /* This compensates the 120px by which app-drawer protrudes under
          * the viewport. */
         bottom: 120px;
       }
 
       #footer-text {
         -webkit-padding-end: 16px;
         -webkit-padding-start: 24px;
+        line-height: 20px;
         margin: 24px 0;
       }
 
       #footer a {
         color: var(--google-blue-700);
         text-decoration: none;
       }
     </style>
 
     <iron-selector id="menu" selected="{{selectedPage}}"
@@ skipping 13 matching lines @@
         $i18n{clearBrowsingData}
       </a>
       <div id="footer" hidden="[[!showFooter]]">
         <div class="separator"></div>
         <div id="footer-text">$i18nRaw{sidebarFooter}</div>
       </div>
     </iron-selector>
   </template>
   <script src="chrome://history/side_bar.js"></script>
 </dom-module>