Update references to the extension messaging APIs to point to the "runtime"

chrome/browser/extensions/extension_bindings_apitest.cc

 // Copyright (c) 2012 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.
 
 // Contains holistic tests of the bindings infrastructure
 
 #include "chrome/browser/extensions/extension_apitest.h"
 
 #include "chrome/browser/extensions/extension_host.h"
 #include "chrome/browser/extensions/extension_process_manager.h"
 #include "chrome/browser/extensions/extension_system.h"
 #include "chrome/browser/ui/browser.h"
 #include "chrome/test/base/ui_test_utils.h"
 #include "content/public/test/browser_test_utils.h"
 
 IN_PROC_BROWSER_TEST_F(ExtensionApiTest, ExceptionInHandlerShouldNotCrash) {
   ASSERT_TRUE(RunExtensionSubtest(
       "bindings/exception_in_handler_should_not_crash",
       "page.html")) << message_;
 }
 
 // Tests that an error raised during an async function still fires
-// the callback, but sets chrome.extension.lastError.
+// the callback, but sets chrome.runtime.lastError.
 IN_PROC_BROWSER_TEST_F(ExtensionBrowserTest, LastError) {
   ASSERT_TRUE(LoadExtension(
       test_data_dir_.AppendASCII("browsertest").AppendASCII("last_error")));
 
   // Get the ExtensionHost that is hosting our background page.
   ExtensionProcessManager* manager =
       extensions::ExtensionSystem::Get(browser()->profile())->process_manager();
   extensions::ExtensionHost* host = FindHostWithPath(manager, "/bg.html", 1);
 
   bool result = false;
   ASSERT_TRUE(content::ExecuteScriptAndExtractBool(
       host->render_view_host(), "testLastError()", &result));
   EXPECT_TRUE(result);
 }