Allow the user to "repair" a corrupted extension.

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 * {
   -webkit-transition-duration: 0 !important;
 }
 
 html:not(.focus-outline-visible)
 :enabled:focus:-webkit-any(input[type='checkbox'], input[type='radio']) {
@@ skipping 195 matching lines @@
 .inactive-extension .extension-title {
   color: inherit;
 }
 
 .extension-version {
   -webkit-padding-end: 7px;
   font-size: 13px;
   font-weight: 400;
 }
 
-.extension-description {
+.extension-description,
+.corrupt-install-message {
   -webkit-padding-end: 5px;
   font-size: 13px;
   margin: 5px 0;
   white-space: normal;
 }
 
+.corrupt-install-message {
+  color: rgb(196, 42, 23);
+}
+
 .action-links {
   -webkit-margin-after: 0.5em;
 }
 
 .action-links :-webkit-any(a, .link-button) {
   -webkit-margin-end: 1em;
   -webkit-margin-start: 0;
 }
 
 .extension-details {
@@ skipping 10 matching lines @@
 .enable-checkbox input:disabled + .enable-checkbox-text {
   color: rgb(151, 156, 160);
 }
 
 .enable-controls {
   /* Matches right: position of dev controls toggle. */
   -webkit-margin-end: 20px;
   position: relative;
 }
 
-.enable-checkbox-text {
+.enable-checkbox-text,
+/* We use x.link-button here so that we get higher specifity than the
+   link-button rules without resorting to the Dark Side (!IMPORTANT). */

[Dan Beam, 2014/09/18 21:36:49]

nit:

  /* Start each comment line with a star,
   * like this. */

[Devlin, 2014/09/19 21:30:08]

Done.

+.terminated-reload-link.link-button,
+.corrupted-repair-button.link-button {
   /* Matches width of trash. */
   -webkit-margin-end: 30px;
 }
 
 .checkbox {
   display: inline-block;
 }
 
 .enabled-text {
   font-weight: bold;
 }
 
 .extension-list-item-wrapper.inactive-extension .enabled-text,
 .extension-list-item-wrapper:not(.inactive-extension) .enable-text,
 .extension-list-item-wrapper.inactive-extension .optional-controls,
 .extension-list-item-wrapper.inactive-extension .butter-bar {
   display: none;
 }
 
 .load-path > span {
   word-wrap: break-word;
 }
 
-.terminated-reload-link {
-  -webkit-margin-end: 2.5em;
+.terminated-reload-link,
+.corrupted-repair-button {
+  display: inline-block;
   padding-top: 7px;
 }
 
 .install-warnings a {
   -webkit-margin-start: 0;
 }
 
 .butter-bar,
 .install-warnings,
 .extension-warnings {
@@ skipping 111 matching lines @@
 /* Sideload Wipeout */
 
 .sideload-wipeout-learn-more {
   text-decoration: none;
 }
 
 .sideload-wipeout-banner .page-banner-text {
   -webkit-padding-start: 8px;
   background-image: none;
 }