Provide ability for WebUIBrowserTests to run asynchronous tests.

chrome/test/data/webui/assertions.js

Index: chrome/test/data/webui/assertions.js
diff --git a/chrome/test/data/webui/assertions.js b/chrome/test/data/webui/assertions.js
index b7f62f5976b961dffc1794295bf8956cc40e398c..daf18735bcd909b7c3f4d4d1aa92395ae06d242e 100644
--- a/chrome/test/data/webui/assertions.js
+++ b/chrome/test/data/webui/assertions.js
@@ -23,7 +23,8 @@ function testTwoExpects() {
 }
 
 TEST_F('WebUIAssertionsTest', 'testTwoExpects', function() {
-  var result = runTest(testTwoExpects, []);
+  var result = runTestFunction('testTwoExpects', testTwoExpects, []);
+  resetTestState();
 
   expectFalse(result[0]);
   expectTrue(!!result[1].match(/expectTrue\(false\): false/));
@@ -41,7 +42,9 @@ function testCallTestTwice() {
 }
 
 TEST_F('WebUIAssertionsTest', 'testCallTestTwice', function() {
-  var result = runTest(testCallTestTwice, []);
+  var result = runTestFunction('testCallTestTwice', testCallTestTwice, []);
+  resetTestState();
+
   expectFalse(result[0]);
   expectEquals(2, result[1].match(
       /expectTrue\(false, 'message1'\): message1: false/g).length);
@@ -55,7 +58,10 @@ function testConstructMessage() {
 }
 
 TEST_F('WebUIAssertionsTest', 'testConstructedMessage', function() {
-  var result = runTest(testConstructMessage, []);
+  var result = runTestFunction(
+      'testConstructMessage', testConstructMessage, []);
+  resetTestState();
+
   expectEquals(
       1, result[1].match(/assertTrue\(false, message\): 1 2: false/g).length);
 });