Settings WebUI: hide extensions link from settings menu when in guest mode

Bug: 910092
Change-Id: I20f669bf401437ac52695274a01f32e08d427170
Reviewed-on: https://chromium-review.googlesource.com/c/1355843Reviewed-by: Hector Carmona <hcarmona@chromium.org>
Commit-Queue: Esmael El-Moslimany <aee@chromium.org>
Cr-Commit-Position: refs/heads/master@{#612738}

chrome/browser/resources/settings/page_visibility.js

@@ -72,6 +72,7 @@ cr.define('settings', function() {
       appearance: false,
       defaultBrowser: false,
       advancedSettings: false,
+      extensions: false,
     };
     // </if>
     // <if expr="chromeos">
@@ -96,6 +97,7 @@ cr.define('settings', function() {
         googleDrive: false,
       },
       multidevice: false,
+      extensions: false,
     };
     // </if>
   } else {
@@ -123,6 +125,7 @@ cr.define('settings', function() {
         googleDrive: true,
       },
       multidevice: true,
+      extensions: true,
     };
     // </if>
   }

chrome/browser/resources/settings/settings_menu/settings_menu.html

@@ -203,6 +203,7 @@
       </iron-collapse>
       <div id="menuSeparator"></div>
       <a id="extensionsLink" href="chrome://extensions" target="_blank"
+          hidden="[[!pageVisibility.extensions]]"
           on-click="onExtensionsLinkClick_"
           title="$i18n{extensionsLinkTooltip}">
         <span>$i18n{extensionsPageTitle}</span>