Allow WebUI Tests to use preLoad in HtmlDialogUI.

chrome/test/data/webui/async_gen.js

 // Copyright (c) 2011 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 /**
  * Test fixture for generated async tests.
  * @extends {testing.Test}
  */
 function WebUIBrowserAsyncGenTest() {}
 
@@ skipping 28 matching lines @@
    */
   tornDown: false,
 
   /**
    * True when running sync portion of test.
    * @type {boolean}
    */
   running: false,
 };
 
-// Include the bulk of c++ code.
-GEN('#include "chrome/test/data/webui/async_gen-inl.h"');
-GEN('');
-
-// Constructors and destructors must be provided in .cc to prevent clang errors.
-GEN('WebUIBrowserAsyncGenTest::WebUIBrowserAsyncGenTest() {}');
-GEN('WebUIBrowserAsyncGenTest::~WebUIBrowserAsyncGenTest() {}');
-GEN('WebUIBrowserAsyncGenTest::AsyncWebUIMessageHandler::');
-GEN('    AsyncWebUIMessageHandler() {}');
-GEN('WebUIBrowserAsyncGenTest::AsyncWebUIMessageHandler::');
-GEN('    ~AsyncWebUIMessageHandler() {}');
-GEN('');
+// Include the c++ test fixture.
+GEN('#include "chrome/test/data/webui/async_gen.h"');
 
 /**
  * Will be set to continuation test #1.
  * @type {Function}
  * @this {WebUIBrowserAsyncGenTest}
  */
 var continueTest;
 
 /**
  * Will be set to continuation test #2.
@@ skipping 205 matching lines @@
     // Cause setTestRanTrue to be invoked asynchronously.
     chrome.send('callJS', ['setTestRanTrue']);
   },
 };
 
 TEST_F('WebUIBrowserAsyncGenDeferredToGlobalTest', 'TestDeferRunTestToGlobal',
        function() {
   this.ranTest_ = true;
   assertTrue(testRan);
 });