Remove LauncherItemController::Launch, cleanup.

chrome/browser/ui/ash/launcher/chrome_launcher_controller_impl_browsertest.cc

Index: chrome/browser/ui/ash/launcher/chrome_launcher_controller_impl_browsertest.cc
diff --git a/chrome/browser/ui/ash/launcher/chrome_launcher_controller_impl_browsertest.cc b/chrome/browser/ui/ash/launcher/chrome_launcher_controller_impl_browsertest.cc
index 42a4047d5ff7eaec37702b49751f5fa9a3bdab48..492cd2cde2797e673b2f0d1890967522f968d9fa 100644
--- a/chrome/browser/ui/ash/launcher/chrome_launcher_controller_impl_browsertest.cc
+++ b/chrome/browser/ui/ash/launcher/chrome_launcher_controller_impl_browsertest.cc
@@ -925,9 +925,8 @@ IN_PROC_BROWSER_TEST_F(ShelfAppBrowserTest, LaunchInBackground) {
   LoadAndLaunchExtension("app1", extensions::LAUNCH_CONTAINER_TAB,
                          WindowOpenDisposition::NEW_BACKGROUND_TAB);
   EXPECT_EQ(++tab_count, tab_strip->count());
-  controller_->LaunchApp(last_loaded_extension_id(),
-                                               ash::LAUNCH_FROM_UNKNOWN,
-                                               0);
+  controller_->LaunchApp(last_loaded_extension_id(), std::string(),
+                         ash::LAUNCH_FROM_UNKNOWN, 0);
 }
 
 // Confirm that clicking a icon for an app running in one of 2 maxmized windows
@@ -977,12 +976,10 @@ IN_PROC_BROWSER_TEST_F(ShelfAppBrowserTest, ActivateApp) {
 IN_PROC_BROWSER_TEST_F(ShelfAppBrowserTest, LaunchApp) {
   TabStripModel* tab_strip = browser()->tab_strip_model();
   int tab_count = tab_strip->count();
-  const Extension* extension =
-      LoadExtension(test_data_dir_.AppendASCII("app1"));
-
-  controller_->LaunchApp(extension->id(), ash::LAUNCH_FROM_UNKNOWN, 0);
+  std::string app_id = LoadExtension(test_data_dir_.AppendASCII("app1"))->id();
+  controller_->LaunchApp(app_id, std::string(), ash::LAUNCH_FROM_UNKNOWN, 0);
   EXPECT_EQ(++tab_count, tab_strip->count());
-  controller_->LaunchApp(extension->id(), ash::LAUNCH_FROM_UNKNOWN, 0);
+  controller_->LaunchApp(app_id, std::string(), ash::LAUNCH_FROM_UNKNOWN, 0);
   EXPECT_EQ(++tab_count, tab_strip->count());
 }