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

ui/aura/remote_root_window_host_win.cc

Index: ui/aura/remote_root_window_host_win.cc
diff --git a/ui/aura/remote_root_window_host_win.cc b/ui/aura/remote_root_window_host_win.cc
index d42853895780c28029f4d507616459a9405f4a8a..c3a10e096002e9f0b2cce9a45effe41d185dc857 100644
--- a/ui/aura/remote_root_window_host_win.cc
+++ b/ui/aura/remote_root_window_host_win.cc
@@ -172,6 +172,14 @@ bool RemoteRootWindowHostWin::OnMessageReceived(const IPC::Message& message) {
   return handled;
 }
 
+void RemoteRootWindowHostWin::HandleOpenURLOnDesktop(
+    const base::FilePath& shortcut,
+    const base::string16& url) {
+  if (!host_)
+    return;
+  host_->Send(new MetroViewerHostMsg_OpenURLOnDesktop(shortcut, url));
+}
+
 void RemoteRootWindowHostWin::HandleOpenFile(
     const base::string16& title,
     const base::FilePath& default_path,