Removes specifying transient at the aura level for top levels

ui/views/widget/desktop_aura/desktop_window_tree_host_x11.cc

Index: ui/views/widget/desktop_aura/desktop_window_tree_host_x11.cc
diff --git a/ui/views/widget/desktop_aura/desktop_window_tree_host_x11.cc b/ui/views/widget/desktop_aura/desktop_window_tree_host_x11.cc
index 785a816130c4433d865d350e7dd480b285929dbc..960c0c012c552cc5bf5137037c99d19c828a6c6e 100644
--- a/ui/views/widget/desktop_aura/desktop_window_tree_host_x11.cc
+++ b/ui/views/widget/desktop_aura/desktop_window_tree_host_x11.cc
@@ -239,13 +239,6 @@ void DesktopWindowTreeHostX11::OnRootWindowCreated(
   dispatcher_->window()->SetProperty(kHostForRootWindow, this);
   delegate_ = dispatcher_;
 
-  // If we're given a parent, we need to mark ourselves as transient to another
-  // window. Otherwise activation gets screwy.
-  gfx::NativeView parent = params.parent;
-  if (!params.child && params.parent) {
-    corewm::AddTransientChild(parent, content_window_);
-  }
-
   // Ensure that the X11DesktopHandler exists so that it dispatches activation
   // messages to us.
   X11DesktopHandler::get();