MD History: Added a clear browsing data button

chrome/browser/resources/md_history/history_toolbar.html

 <link rel="import" href="chrome://resources/polymer/v1_0/polymer/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/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/cr_elements/cr_search_field/cr_search_field.html">
 
 <dom-module id="history-toolbar">
   <template>
 
     <style>
@@ skipping 29 matching lines @@
       #number-selected {
         @apply(--layout-flex);
       }
 
       paper-icon-button {
         height: 36px;
         margin: 0 24px 0 2px;
         min-width: 36px;
         width: 36px;
       }
+
+      #clear-browsing-data {
+        margin-right: 30px;

[tsergeant, 2016/02/02 04:21:33]

Nit: RTL

[yingran, 2016/02/03 23:25:52]

Acknowledged.

+      }
     </style>
 
     <template is="dom-if" if="{{!itemsSelected_}}">
       <h1 i18n-content="title" id="title"></h1>
+      <paper-button id="clear-browsing-data" on-tap="clearBrowsingData"
+        i18n-content="clearBrowsingData">
+      </paper-button>
       <cr-search-field id="search-input"
           i18n-values="label:search;clear-label:clearSearch"></cr-search-field>
     </template>
 
     <template is="dom-if" if="{{itemsSelected_}}">
       <div id="items">
         <paper-icon-button icon="clear" id="cancel-icon-button"
             on-tap="onClearSelectionTap_">
         </paper-icon-button>
         <!-- TODO: change "selected" and number to an i18n (or equivalent)
               string -->
         <div id="number-selected">{{count}} selected</div>
         <paper-button id="cancel-button" on-tap="onClearSelectionTap_">
           CANCEL
         </paper-button>
         <paper-button id="delete-button">DELETE</paper-button>
       </div>
     </template>
 
   </template>
   <script src="chrome://history/history_toolbar.js"></script>
 </dom-module>