Simplify mojo_shell since it's now only used for Mandoline.

mojo/services/kiosk_wm/kiosk_wm.cc

Index: mojo/services/kiosk_wm/kiosk_wm.cc
diff --git a/mojo/services/kiosk_wm/kiosk_wm.cc b/mojo/services/kiosk_wm/kiosk_wm.cc
index 444003a73cf3e88628834068c43892e09d438baf..5c03ade042b0fc5948cf2ab9be01c59dc174d2ae 100644
--- a/mojo/services/kiosk_wm/kiosk_wm.cc
+++ b/mojo/services/kiosk_wm/kiosk_wm.cc
@@ -4,6 +4,8 @@
 
 #include "mojo/services/kiosk_wm/kiosk_wm.h"
 
+#include "base/command_line.h"
+#include "base/strings/utf_string_conversions.h"
 #include "mojo/services/kiosk_wm/merged_service_provider.h"
 #include "mojo/services/window_manager/basic_focus_rules.h"
 
@@ -28,9 +30,17 @@ base::WeakPtr<KioskWM> KioskWM::GetWeakPtr() {
 void KioskWM::Initialize(mojo::ApplicationImpl* app) {
   window_manager_app_->Initialize(app);
 
-  // Format: --args-for="app_url default_url"
-  if (app->args().size() > 1)
-    default_url_ = app->args()[1];
+  base::CommandLine* command_line = base::CommandLine::ForCurrentProcess();
+  base::CommandLine::StringVector args = command_line->GetArgs();
+  if (args.empty()) {
+    default_url_ = "http://www.google.com/";
+  } else {
+#if defined(OS_WIN)
+    default_url_ = base::WideToUTF8(args[0]);
+#else
+    default_url_ = args[0];
+#endif
+  }
 }
 
 bool KioskWM::ConfigureIncomingConnection(