Aura/ash split: Don't use X11 window borders.

ui/aura/root_window.cc

Index: ui/aura/root_window.cc
diff --git a/ui/aura/root_window.cc b/ui/aura/root_window.cc
index 4dfdc97eb45810329b9459ec21ac43d9a13d804f..265d09c0393f43e27b18aff0c2a404e6e2f6f302 100644
--- a/ui/aura/root_window.cc
+++ b/ui/aura/root_window.cc
@@ -235,6 +235,10 @@ void RootWindow::ScheduleFullDraw() {
   compositor_->ScheduleFullDraw();
 }
 
+void RootWindow::SetUseHostWindowBorders(bool use_os_borders) {
+  host_->SetUseHostWindowBorders(use_os_borders);
+}
+
 bool RootWindow::DispatchMouseEvent(MouseEvent* event) {
   if (mouse_move_hold_count_) {
     if (event->type() == ui::ET_MOUSE_DRAGGED ||
@@ -373,6 +377,11 @@ bool RootWindow::DispatchGestureEvent(GestureEvent* event) {
   return false;
 }
 
+bool RootWindow::DispatchHostWindowDragMovement(int hittest,
+                                                MouseEvent* event) {
+  return host_->DispatchHostWindowDragMovement(hittest, event);
+}
+
 void RootWindow::OnHostResized(const gfx::Size& size_in_pixel) {
   DispatchHeldMouseMove();
   // The compositor should have the same size as the native root window host.