Introduce LaunchParams struct for opening chrome apps.

chrome/browser/autocomplete/extension_app_provider.cc

Index: chrome/browser/autocomplete/extension_app_provider.cc
diff --git a/chrome/browser/autocomplete/extension_app_provider.cc b/chrome/browser/autocomplete/extension_app_provider.cc
index 5c91c84295654e2c12bea73984b78ed0d2cca9c3..07848cb4f08c16fe93d668ebc384513ce69bb104 100644
--- a/chrome/browser/autocomplete/extension_app_provider.cc
+++ b/chrome/browser/autocomplete/extension_app_provider.cc
@@ -61,8 +61,8 @@ void ExtensionAppProvider::LaunchAppFromOmnibox(
       service->extension_prefs()->GetLaunchContainer(
           extension, extensions::ExtensionPrefs::LAUNCH_REGULAR);
 
-  application_launch::OpenApplication(profile, extension, launch_container,
-                                      GURL(), disposition, NULL);
+  application_launch::OpenApplication(application_launch::LaunchParams(
+          profile, extension, launch_container, disposition));
 }
 
 void ExtensionAppProvider::AddExtensionAppForTesting(