Extract LazyBackgroundTaskQueue from ExtensionSystem.

chrome/browser/extensions/test_extension_system.cc

Index: chrome/browser/extensions/test_extension_system.cc
diff --git a/chrome/browser/extensions/test_extension_system.cc b/chrome/browser/extensions/test_extension_system.cc
index f1d5b1c8cdf7d6a25d03389262ac43bc506206c9..6373c715095123544cb6979c4b8d6cd12b18a44e 100644
--- a/chrome/browser/extensions/test_extension_system.cc
+++ b/chrome/browser/extensions/test_extension_system.cc
@@ -49,10 +49,6 @@ void TestExtensionSystem::Shutdown() {
     extension_service_->Shutdown();
 }
 
-void TestExtensionSystem::CreateLazyBackgroundTaskQueue() {
-  lazy_background_task_queue_.reset(new LazyBackgroundTaskQueue(profile_));
-}
-
 ExtensionPrefs* TestExtensionSystem::CreateExtensionPrefs(
     const base::CommandLine* command_line,
     const base::FilePath& install_directory) {
@@ -144,11 +140,6 @@ StateStore* TestExtensionSystem::rules_store() {
 
 InfoMap* TestExtensionSystem::info_map() { return info_map_.get(); }
 
-LazyBackgroundTaskQueue*
-TestExtensionSystem::lazy_background_task_queue() {
-  return lazy_background_task_queue_.get();
-}
-
 void TestExtensionSystem::SetEventRouter(scoped_ptr<EventRouter> event_router) {
   event_router_.reset(event_router.release());
 }