[MD Extensions] Add newlines between style rules in HTML

chrome/browser/resources/md_extensions/pack_dialog.html

 <link rel="import" href="chrome://resources/html/assert.html">
 <link rel="import" href="chrome://resources/html/cr.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-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/polymer/v1_0/paper-input/paper-input.html">
 <link rel="import" href="chrome://resources/polymer/v1_0/paper-styles/shadow.html">
 
 <dom-module id="extensions-pack-dialog">
   <template>
     <style>
       dialog {
         @apply(--shadow-elevation-2dp);
         border: none;
         border-radius: 2px;
         padding: 0;
       }
+
       header {
         align-items: center;
         border-bottom: 1px solid var(--paper-grey-200);
         color: var(--paper-grey-800);
         display: flex;
         justify-content: space-between;
         padding: 12px 20px;
       }
+
       #main {
         color: var(--paper-grey-800);
         max-width: 800px;
         padding: 20px;
         width: 512px;
       }
+
       paper-button {
         align-items: center;
         border-radius: 2px;
         cursor: pointer;
         display: flex;
         justify-content: center;
         padding: 8px 12px;
         text-transform: uppercase;
       }
+
       .file-input {
         display: flex;
       }
+
       .file-input paper-input {
         flex: 1;
       }
+
       .file-input paper-button {
         -webkit-margin-start: 10px;
         color: var(--google-blue-500);
       }
+
       #buttons-container {
         display: flex;
         justify-content: flex-end;
         padding: 20px;
       }
+
       #confirm {
         -webkit-margin-start: 12px;
         background-color: var(--google-blue-500);
         color: white;
       }
     </style>
     <dialog>
       <header>
         <span>$i18n{packDialogTitle}</span>
         <paper-icon-button id="close-button" icon="close" on-tap="close">
@@ skipping 23 matching lines @@
           $i18n{packDialogCancel}
         </paper-button>
         <paper-button id="confirm" on-tap="onConfirmTap_">
           $i18n{packDialogConfirm}
         </paper-button>
       </div>
     </dialog>
   </template>
   <script src="chrome://extensions/pack_dialog.js"></script>
 </dom-module>