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 d1cb9f9d5a4e3e7f68905d128024b8261f624813..f9a14e15ca8a4a5c3adec2031096ccccddf24e39 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">
     /** @type {MetricsReporting} */
     metricsReporting_: Object,