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

ui/aura/root_window_host_mac.mm

Index: ui/aura/root_window_host_mac.mm
diff --git a/ui/aura/root_window_host_mac.mm b/ui/aura/root_window_host_mac.mm
index fb3caaaaf905b393050df5bc2ce6dae28f9b50f2..29e1f69a6df5efdff09e6d789cc5a518723a85cd 100644
--- a/ui/aura/root_window_host_mac.mm
+++ b/ui/aura/root_window_host_mac.mm
@@ -45,6 +45,9 @@ class RootWindowHostMac : public RootWindowHost,
   virtual void MoveCursorTo(const gfx::Point& location) OVERRIDE;
   virtual bool ConfineCursorToRootWindow() OVERRIDE;
   virtual void UnConfineCursor() OVERRIDE;
+  virtual void SetUseOSWindowBorders(bool use_os_borders) OVERRIDE;
+  virtual bool DispatchWindowDragMovement(int hittest,
+                                          MouseEvent* event) OVERRIDE;
 
   // RootWindowHostMacDelegate:
   virtual void SendEvent(const base::NativeEvent& native_event) OVERRIDE;
@@ -169,6 +172,14 @@ bool RootWindowHostMac::ConfineCursorToRootWindow() {
 void RootWindowHostMac::UnConfineCursor() {
 }
 
+void RootWindowHostMac::SetUseOSWindowBorders(bool use_os_borders) {
+}
+
+bool RootWindowHostMac::DispatchWindowDragMovement(int hittest,
+                                                   MouseEvent* event) {
+  return false;
+}
+
 void RootWindowHostMac::SendEvent(const base::NativeEvent& native_event) {
   ui::EventType type = ui::EventTypeFromNative(native_event);
   switch (type) {