Centralize command line checks for kEnableStreamlinedHostedApps.

chrome/browser/ui/startup/startup_browser_creator_impl.cc

Index: chrome/browser/ui/startup/startup_browser_creator_impl.cc
diff --git a/chrome/browser/ui/startup/startup_browser_creator_impl.cc b/chrome/browser/ui/startup/startup_browser_creator_impl.cc
index 3c6ae4937bfe2e6b5b69cec62ec0166d90e40814..0daaa42a020308b2d78500e7cbc75cd04a0c53b5 100644
--- a/chrome/browser/ui/startup/startup_browser_creator_impl.cc
+++ b/chrome/browser/ui/startup/startup_browser_creator_impl.cc
@@ -33,6 +33,7 @@
 #include "chrome/browser/custom_handlers/protocol_handler_registry_factory.h"
 #include "chrome/browser/defaults.h"
 #include "chrome/browser/extensions/extension_creator.h"
+#include "chrome/browser/extensions/extension_util.h"
 #include "chrome/browser/extensions/launch_util.h"
 #include "chrome/browser/extensions/pack_extension_job.h"
 #include "chrome/browser/first_run/first_run.h"
@@ -201,8 +202,7 @@ bool GetAppLaunchContainer(
   extensions::LaunchContainer launch_container = extensions::GetLaunchContainer(
       extensions::ExtensionPrefs::Get(profile), extension);
 
-  if (!CommandLine::ForCurrentProcess()->HasSwitch(
-           switches::kEnableStreamlinedHostedApps) &&
+  if (!extensions::util::IsStreamlinedHostedAppsEnabled() &&
       !extensions::HasPreferredLaunchContainer(
            extensions::ExtensionPrefs::Get(profile), extension)) {
     launch_container = extensions::LAUNCH_CONTAINER_WINDOW;