Convert Google Now's Authentication Manager to use Promises

chrome/browser/resources/google_now/background.js

Index: chrome/browser/resources/google_now/background.js
diff --git a/chrome/browser/resources/google_now/background.js b/chrome/browser/resources/google_now/background.js
index 032df708ea2a3b9798e31f82b1d8728b629a41bc..b5718f80f0ed24420ab5b824c0dd9d8bd7968686 100644
--- a/chrome/browser/resources/google_now/background.js
+++ b/chrome/browser/resources/google_now/background.js
@@ -265,12 +265,7 @@ function recordEvent(event) {
  *     parameter.
  */
 function setAuthorization(request, callbackBoolean) {
-  authenticationManager.getAuthToken(function(token) {
-    if (!token) {
-      callbackBoolean(false);
-      return;
-    }
-
+  authenticationManager.getAuthToken().then(function(token) {
     request.setRequestHeader('Authorization', 'Bearer ' + token);
 
     // Instrument onloadend to remove stale auth tokens.
@@ -278,7 +273,7 @@ function setAuthorization(request, callbackBoolean) {
     request.onloadend = wrapper.wrapCallback(function(event) {
       if (request.status == HTTP_FORBIDDEN ||
           request.status == HTTP_UNAUTHORIZED) {
-        authenticationManager.removeToken(token, function() {
+        authenticationManager.removeToken(token).then(function() {
           originalOnLoadEnd(event);
         });
       } else {
@@ -287,6 +282,8 @@ function setAuthorization(request, callbackBoolean) {
     });
 
     callbackBoolean(true);
+  }).catch(function() {
+    callbackBoolean(false);
   });
 }
 
@@ -1090,7 +1087,7 @@ function updateRunningState(
 function onStateChange() {
   tasks.add(STATE_CHANGED_TASK_NAME, function() {
     Promise.all([
-        isSignedIn(),
+        authenticationManager.isSignedIn(),
         isGeolocationEnabled(),
         canEnableBackground(),
         isNotificationsEnabled(),
@@ -1102,18 +1099,6 @@ function onStateChange() {
 }
 
 /**
- * Determines if the user is signed in.
- * @return {Promise} A promise to evaluate the signed in state.
- */
-function isSignedIn() {
-  return new Promise(function(resolve) {
-    authenticationManager.isSignedIn(function(signedIn) {
-      resolve(signedIn);
-    });
-  });
-}
-
-/**
  * Gets the geolocation enabled preference.
  * @return {Promise} A promise to get the geolocation enabled preference.
  */