Makes PlatformEventSource creation in Env conditional

chrome/browser/extensions/test_extension_environment.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.
 
 #include "chrome/browser/extensions/test_extension_environment.h"
 
 #include "base/command_line.h"
 #include "base/json/json_writer.h"
 #include "base/run_loop.h"
 #include "base/values.h"
@@ skipping 14 matching lines @@
 
 namespace extensions {
 
 using content::BrowserThread;
 
 TestExtensionEnvironment::TestExtensionEnvironment()
     : profile_(new TestingProfile),
       extension_service_(NULL),
       extension_prefs_(NULL) {
 #if defined(USE_AURA)
-  aura::Env::CreateInstance();
+  aura::Env::CreateInstance(true);
 #endif
 }
 
 TestExtensionEnvironment::~TestExtensionEnvironment() {
 #if defined(USE_AURA)
   aura::Env::DeleteInstance();
 #endif
 }
 
 TestingProfile* TestExtensionEnvironment::profile() const {
@@ skipping 44 matching lines @@
 
 scoped_ptr<content::WebContents> TestExtensionEnvironment::MakeTab() const {
   scoped_ptr<content::WebContents> contents(
       content::WebContentsTester::CreateTestWebContents(profile(), NULL));
   // Create a tab id.
   SessionTabHelper::CreateForWebContents(contents.get());
   return contents.Pass();
 }
 
 }  // namespace extensions