Implement important sites dialog for desktop.

ui/webui/resources/cr_elements/cr_dialog/cr_dialog.html

 <link rel="import" href="chrome://resources/cr_elements/icons.html">
 <link rel="import" href="chrome://resources/html/assert.html">
 <link rel="import" href="chrome://resources/html/polymer.html">
 <link rel="import" href="chrome://resources/polymer/v1_0/paper-icon-button/paper-icon-button.html">
 <link rel="import" href="chrome://resources/polymer/v1_0/paper-styles/default-theme.html">
 
 <dom-module id="cr-dialog">
   <template>
     <style>
       :host {
@@ skipping 30 matching lines @@
         position: fixed;
         right: 0;
         top: 0;
       }
 
       :host ::content .body {
         padding: 12px 16px;
       }
 
       :host ::content .title {
-        font-size: 115.38%;  /* (15px / 13px) * 100 */
+        font-size: calc(15 / 13 * 100%);
         line-height: 1;
         padding: 16px 16px;
         flex: 1;
       }
 
       :host ::content .button-container {
         padding: 16px 16px;
         display: flex;
         justify-content: flex-end;
       }
@@ skipping 51 matching lines @@
         --paper-icon-button: {
           height: 36px;
           width: 36px;
         };
 
         --layout-inline: {
           display: flex;
         };
 
         -webkit-margin-end: 4px;
+        align-self: flex-start;
         margin-top: 4px;
         padding: 10px;  /* Makes the actual icon 16x16. */
       }
     </style>
     <div class="top-container">
       <div class="title-container" tabindex="-1">
         <content select=".title"></content>
       </div>
       <paper-icon-button icon="cr:clear" on-tap="cancel" id="close"
           aria-label$="[[closeText]]">
       </paper-icon-button>
     </div>
     <div class="body-container">
       <span id="bodyTopMarker"></span>
       <content select=".body"></content>
       <span id="bodyBottomMarker"></span>
     </div>
     <content select=".button-container"></content>
     <content select=".footer"></content>
   </template>
   <script src="cr_dialog.js"></script>
 </dom-module>