MD History: Update Search Icon Margins

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/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">
 <link rel="import" href="chrome://history/shared_style.html">
 
 <dom-module id="history-toolbar">
   <template>
     <style include="shared-style"></style>
@@ skipping 19 matching lines @@
         background: rgb(68, 136, 255);
       }
 
       h1 {
         @apply(--layout-flex);
         font-size: 16px;
         font-weight: 400;
         padding-left: 24px;
       }
 
+      #search-input {
+        -webkit-padding-end: 20px;
+      }
+
       #items {
         margin: 0 auto;
         max-width: var(--card-max-width);
       }
 
       #number-selected {
         @apply(--layout-flex);
       }
 
       paper-icon-button {
@@ skipping 55 matching lines @@
         <paper-button on-tap="onClearBrowsingDataTap_"
             id="clear-browsing-data-button">
           $i18n{clearBrowsingData}
         </paper-button>
       </div>
       <div id="back-padding"></div>
     </div>
   </template>
   <script src="chrome://history/history_toolbar.js"></script>
 </dom-module>