MD Settings: Content Settings: Support guest mode.

chrome/browser/resources/settings/privacy_page/privacy_page.js

Index: chrome/browser/resources/settings/privacy_page/privacy_page.js
diff --git a/chrome/browser/resources/settings/privacy_page/privacy_page.js b/chrome/browser/resources/settings/privacy_page/privacy_page.js
index d1fb6d9e9510026b27dcad95b891a2c36abee11a..24b6a3105db3f896730fbe485cdd5377eaee5147 100644
--- a/chrome/browser/resources/settings/privacy_page/privacy_page.js
+++ b/chrome/browser/resources/settings/privacy_page/privacy_page.js
@@ -31,6 +31,12 @@ Polymer({
      */
     pageVisibility: Object,
 
+    /** @private */
+    isGuest_: {
+      type: Boolean,
+      value: function() { return loadTimeData.getBoolean('isGuest'); }
+    },
+
 // <if expr="_google_chrome and not chromeos">
     // TODO(dbeam): make a virtual.* pref namespace and set/get this normally
     // (but handled differently in C++).