More <settings-dialog> tweaks to match the spec.

chrome/browser/resources/settings/settings_dialog.html

 <link rel="import" href="chrome://resources/html/polymer.html">
 <link rel="import" href="chrome://resources/polymer/v1_0/iron-icons/iron-icons.html">
 <link rel="import" href="chrome://resources/polymer/v1_0/paper-dialog-behavior/paper-dialog-behavior.html">
 <link rel="import" href="chrome://resources/polymer/v1_0/paper-dialog-behavior/paper-dialog-shared-styles.html">
 <link rel="import" href="chrome://resources/polymer/v1_0/paper-icon-button/paper-icon-button.html">
 
 <dom-module id="settings-dialog">
   <template>
     <style include="paper-dialog-shared-styles"></style>
     <style>
       .body-content {
         display: flex;
         flex-direction: column;
-        font-size: 1em;
         min-height: 120px;
       }
 
       .dialog-content {
         -webkit-padding-end: 0;
         -webkit-padding-start: 0;
         margin-bottom: 0;
         margin-top: 0;
       }
 
@@ skipping 10 matching lines @@
       }
 
       paper-icon-button {
         height: 20px;
         margin: 16px;
         padding: 0;
         width: 20px;
       }
 
       :host {
+        border-radius: 2px;
         max-width: 800px;
         min-width: 512px;
         overflow: auto;
       }
 
+      :host ::content .body,
+      :host ::content .footer,
+      :host ::content paper-button {
+        font-size: 92.86%; /* (13px / 14px) * 100 */
+      }
+
       :host ::content .body {
-        flex: 1;
         margin: 12px 0 24px 0;
       }
 
       :host ::content .button-container {
+        -webkit-padding-end: 16px;
+        -webkit-padding-start: 16px;
         display: flex;
         justify-content: flex-end;
         margin-bottom: 12px;
       }
 
       :host ::content .button-container .cancel-button {
         -webkit-margin-end: 8px;
         color: var(--paper-grey-600);
         font-weight: 500;
       }
 
       :host ::content .footer {
         background-color: var(--paper-grey-200);
         margin: 0;
         padding: 20px;
       }
 
       :host ::content .row {
         align-items: center;
         display: flex;
         min-height: 40px;
       }
 
       :host ::content .row .start {
         flex: 1;
       }
 
       :host ::content .title {
-        flex: 1;
         font-size: 114.28%; /* (16px / 14px) * 100 */
       }
 
-      :host ::content .title,
-      .body-content {
+      :host ::content .body,
+      :host ::content .title {
         -webkit-padding-end: 24px;
         -webkit-padding-start: 24px;
+        flex: 1;
       }
     </style>
     <div class="dialog-content">
       <div class="top-row">
         <content select=".title"></content>
         <paper-icon-button icon="clear" on-tap="cancel" id="close">
         </paper-icon-button>
       </div>
       <div class="body-content">
         <content select=".body"></content>
         <content select=".button-container"></content>
       </div>
     </div>
     <div class="footer-container">
       <content select=".footer"></content>
     </div>
   </template>
   <script src="settings_dialog.js"></script>
 </dom-module>