[Extensions] Update Error Console UI

chrome/browser/resources/extensions/extensions.css

 /* Copyright (c) 2012 The Chromium Authors. All rights reserved.
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file. */
 
 html.loading * {
   transition-duration: 0ms !important;
 }
 
 html:not(.focus-outline-visible)
 :enabled:focus:-webkit-any(input[type='checkbox'], input[type='radio']) {
@@ skipping 102 matching lines @@
 
 .extension-code-line-numbers {
   align-self: flex-start;
   background-color: rgba(240, 240, 240, 1);
   border-right: 1px solid #ccc;
   color: rgba(128, 128, 128, 1);
   flex-shrink: 0;
   text-align: right;
 }
 
+.extension-code-empty {
+  background-color: #eee;
+  display: inline-block;
+  line-height: 100px;  /* vertically centers text and serves as min-height. */

[Dan Beam, 2015/03/31 00:33:50]

nit: Vertically

[Devlin, 2015/03/31 16:17:51]

Done.

+  text-align: center;
+  width: 100%;
+}
+
 .developer-extras > div,
 .permanent-warnings > div {
   margin: 5px 0;
 }
 
 #extension-settings #page-header {
   /* These values match the .page values. */
   -webkit-margin-end: 24px;
   min-width: 576px;
 }
@@ skipping 81 matching lines @@
 
 .action-links {
   margin-bottom: 0.5em;
 }
 
 .action-links a {
   -webkit-margin-end: 1em;
   -webkit-margin-start: 0;
 }
 
+.action-links .errors-link {
+  align-items: center;
+  display: inline-flex;
+  vertical-align: bottom;
+}
+
 .extension-details {
   -webkit-box-flex: 1;
   -webkit-padding-end: 7px;
   -webkit-padding-start: 55px;
 }
 
 .extension-description,
 .extension-version,
 .extension-list-item-wrapper.inactive-extension .extension-details,
 .location-text,
@@ skipping 169 matching lines @@
 /* Sideload Wipeout */
 
 .sideload-wipeout-learn-more {
   text-decoration: none;
 }
 
 .sideload-wipeout-banner .page-banner-text {
   -webkit-padding-start: 8px;
   background-image: none;
 }