Revert of Convert Google Now's Authentication Manager to use Promises

chrome/browser/resources/google_now/common_test_util.js

Index: chrome/browser/resources/google_now/common_test_util.js
diff --git a/chrome/browser/resources/google_now/common_test_util.js b/chrome/browser/resources/google_now/common_test_util.js
index 44d21e6d1f640ea07406a7919738959bcbb09706..754e2578fa2f6bf059a5b2b70fbb7ea8c6ed0bed 100644
--- a/chrome/browser/resources/google_now/common_test_util.js
+++ b/chrome/browser/resources/google_now/common_test_util.js
@@ -82,35 +82,16 @@
 var Promise = function() {
   function PromisePrototypeObject(asyncTask) {
     var result;
-    var resolved = false;
     asyncTask(
         function(asyncResult) {
           result = asyncResult;
-          resolved = true;
         },
-        function(asyncFailureResult) {
-          result = asyncFailureResult;
-          resolved = false;
-        });
+        function() {}); // Errors are unsupported.
 
     function then(callback) {
-      if (resolved) {
-        callback.call(null, result);
-      }
-      return this;
+      callback.call(null, result);
     }
-
-    // Promises use the function name "catch" to call back error handlers.
-    // We can't use "catch" since function or variable names cannot use the word
-    // "catch".
-    function catchFunc(callback) {
-      if (!resolved) {
-        callback.call(null, result);
-      }
-      return this;
-    }
-
-    return {then: then, catch: catchFunc, isPromise: true};
+    return {then: then, isPromise: true};
   }
 
   function all(arrayOfPromises) {