Make the metro viewer responsible for relaunching browser in desktop mode.

ui/aura/remote_root_window_host_win.h

Index: ui/aura/remote_root_window_host_win.h
diff --git a/ui/aura/remote_root_window_host_win.h b/ui/aura/remote_root_window_host_win.h
index e2e6d1ca28692f398226cde669e4f141643e43e6..dbdd2e873b32bef5fe358fc96e5472cdee6b041b 100644
--- a/ui/aura/remote_root_window_host_win.h
+++ b/ui/aura/remote_root_window_host_win.h
@@ -98,6 +98,9 @@ class AURA_EXPORT RemoteRootWindowHostWin : public RootWindowHost {
   // Called when we have a message from the remote process.
   bool OnMessageReceived(const IPC::Message& message);
 
+  void HandleOpenURLOnDesktop(const base::FilePath& shortcut,
+                              const base::string16& url);
+
   void HandleOpenFile(const base::string16& title,
                       const base::FilePath& default_path,
                       const base::string16& filter,