Safety check UI: icon for 'managed by extension'

Bug: 1015841
Change-Id: I885c7dc96bcd4410c288156344f017e130414071
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2111315Reviewed-by: Esmael Elmoslimany <aee@chromium.org>
Commit-Queue: Rainhard Findling <rainhard@chromium.org>
Cr-Commit-Position: refs/heads/master@{#752047}

chrome/browser/resources/settings/safety_check_page/safety_check_page.html

@@ -153,8 +153,8 @@
         <template is="dom-if"
             if="[[shouldShowSafeBrowsingManagedIcon_(safeBrowsingStatus_)]]"
             restamp>
-          <iron-icon id="safetyCheckSafeBrowsingManagedIcon" icon="cr20:domain"
-              aria-hidden="true">
+          <iron-icon id="safetyCheckSafeBrowsingManagedIcon" aria-hidden="true"
+              icon="[[getSafeBrowsingManagedIcon_(safeBrowsingStatus_)]]">
           </iron-icon>
         </template>
       </div>

chrome/browser/resources/settings/safety_check_page/safety_check_page.js

@@ -500,12 +500,21 @@ Polymer({
    * @return {boolean}
    */
   shouldShowSafeBrowsingManagedIcon_: function() {
+    return this.getSafeBrowsingManagedIcon_() != null;
+  },
+
+  /**
+   * @private
+   * @return {?string}
+   */
+  getSafeBrowsingManagedIcon_: function() {
     switch (this.safeBrowsingStatus_) {
       case settings.SafetyCheckSafeBrowsingStatus.DISABLED_BY_ADMIN:
+        return 'cr20:domain';
       case settings.SafetyCheckSafeBrowsingStatus.DISABLED_BY_EXTENSION:
-        return true;
+        return 'cr:extension';
       default:
-        return false;
+        return null;
     }
   },