Create a LegacyExtensionBrowserTest class that lets us test extensions with

chrome/browser/extensions/extension_icon_source_apitest.cc

 // 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.
 
 #include "base/logging.h"
 #include "chrome/browser/extensions/extension_apitest.h"
 #include "chrome/browser/extensions/extension_service.h"
 #include "chrome/browser/profiles/profile.h"
 #include "chrome/browser/ui/browser.h"
 #include "chrome/browser/ui/browser_list.h"
+#include "chrome/common/chrome_switches.h"
 #include "chrome/test/base/ui_test_utils.h"
 #include "content/browser/tab_contents/tab_contents.h"
 #include "googleurl/src/gurl.h"
 #include "net/base/mock_host_resolver.h"
 
 class ExtensionIconSourceTest : public ExtensionApiTest {
+ protected:
+  virtual void SetUpCommandLine(CommandLine* command_line) OVERRIDE {
+    ExtensionApiTest::SetUpCommandLine(command_line);
+    command_line->AppendSwitch(switches::kAllowLegacyExtensionManifests);
+  }
 };
 
 IN_PROC_BROWSER_TEST_F(ExtensionIconSourceTest, IconsLoaded) {
   FilePath basedir = test_data_dir_.AppendASCII("icons");
   ASSERT_TRUE(LoadExtension(basedir.AppendASCII("extension_with_permission")));
   ASSERT_TRUE(LoadExtension(basedir.AppendASCII("extension_no_permission")));
   std::string result;
 
   // Test that the icons are loaded and that the chrome://extension-icon
   // parameters work correctly.
@@ skipping 43 matching lines @@
   // without the management permission.
   ui_test_utils::OpenURLOffTheRecord(
       browser()->profile(),
       GURL("chrome-extension://apocjbpjpkghdepdngjlknfpmabcmlao/index.html"));
   ASSERT_TRUE(ui_test_utils::ExecuteJavaScriptAndExtractString(
       otr_browser->GetSelectedTabContents()->render_view_host(), L"",
       L"window.domAutomationController.send(document.title)",
       &result));
   EXPECT_EQ(result, "Not Loaded");
 }