[Md Feedback] Add the rest of existing strings.

chrome/browser/resources/md_feedback/feedback_container.js

Index: chrome/browser/resources/md_feedback/feedback_container.js
diff --git a/chrome/browser/resources/md_feedback/feedback_container.js b/chrome/browser/resources/md_feedback/feedback_container.js
index 403aa3515b3358a6fca9dfb5145e0826f55b9ed2..7caa6ab00318f7fa489f829ad5ebf3b98e956b2b 100644
--- a/chrome/browser/resources/md_feedback/feedback_container.js
+++ b/chrome/browser/resources/md_feedback/feedback_container.js
@@ -7,4 +7,15 @@
 // to show and what will be submitted to the feedback servers.
 Polymer({
   is: 'feedback-container',
+
+  /**
+   * Retrieves the feedback privacy note text, if it exists. On non-officially
+   * branded builds, the string is not defined.
+   *
+   * @return {string} Privacy note text.
+   */
+  getPrivacyNote_: function() {
+    return loadTimeData.valueExists('privacyNote') ?
+        this.i18n('privacyNote') : '';
+  },
 });