It is time.

ui/aura/window_tree_host_mac.mm

Index: ui/aura/window_tree_host_mac.mm
diff --git a/ui/aura/window_tree_host_mac.mm b/ui/aura/window_tree_host_mac.mm
deleted file mode 100644
index 7fb3f82a2eccfaf21e25016c10aab245ff45a461..0000000000000000000000000000000000000000
--- a/ui/aura/window_tree_host_mac.mm
+++ /dev/null
@@ -1,114 +0,0 @@
-// Copyright 2014 The Chromium Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style license that can be
-// found in the LICENSE file.
-
-#include <Cocoa/Cocoa.h>
-
-#include "ui/aura/window_tree_host_mac.h"
-#include "ui/aura/window_tree_host.h"
-
-namespace aura {
-
-WindowTreeHostMac::WindowTreeHostMac(const gfx::Rect& bounds) {
-  window_.reset(
-      [[NSWindow alloc]
-          initWithContentRect:NSRectFromCGRect(bounds.ToCGRect())
-                    styleMask:NSBorderlessWindowMask
-                      backing:NSBackingStoreBuffered
-                        defer:NO]);
-  CreateCompositor(GetAcceleratedWidget());
-}
-
-WindowTreeHostMac::~WindowTreeHostMac() {
-  DestroyDispatcher();
-}
-
-EventSource* WindowTreeHostMac::GetEventSource() {
-  NOTIMPLEMENTED();
-  return nil;
-}
-
-gfx::AcceleratedWidget WindowTreeHostMac::GetAcceleratedWidget() {
-  return [window_ contentView];
-}
-void WindowTreeHostMac::Show() {
-  [window_ makeKeyAndOrderFront:nil];
-}
-
-void WindowTreeHostMac::Hide() {
-  [window_ orderOut:nil];
-}
-
-void WindowTreeHostMac::ToggleFullScreen() {
-}
-
-gfx::Rect WindowTreeHostMac::GetBounds() const {
-  return gfx::Rect(NSRectToCGRect([window_ frame]));
-}
-
-void WindowTreeHostMac::SetBounds(const gfx::Rect& bounds) {
-  [window_ setFrame:NSRectFromCGRect(bounds.ToCGRect()) display:YES animate:NO];
-}
-
-gfx::Insets WindowTreeHostMac::GetInsets() const {
-  NOTIMPLEMENTED();
-  return gfx::Insets();
-}
-
-void WindowTreeHostMac::SetInsets(const gfx::Insets& insets) {
-  NOTIMPLEMENTED();
-}
-
-gfx::Point WindowTreeHostMac::GetLocationOnNativeScreen() const {
-  NOTIMPLEMENTED();
-  return gfx::Point(0, 0);
-}
-
-void WindowTreeHostMac::SetCapture() {
-  NOTIMPLEMENTED();
-}
-
-void WindowTreeHostMac::ReleaseCapture() {
-  NOTIMPLEMENTED();
-}
-
-bool WindowTreeHostMac::ConfineCursorToRootWindow() {
-  return false;
-}
-
-void WindowTreeHostMac::UnConfineCursor() {
-  NOTIMPLEMENTED();
-}
-
-void WindowTreeHostMac::SetCursorNative(gfx::NativeCursor cursor_type) {
-  NOTIMPLEMENTED();
-}
-
-void WindowTreeHostMac::MoveCursorToNative(const gfx::Point& location) {
-  NOTIMPLEMENTED();
-}
-
-void WindowTreeHostMac::OnCursorVisibilityChangedNative(bool show) {
-  NOTIMPLEMENTED();
-}
-
-void WindowTreeHostMac::PostNativeEvent(const base::NativeEvent& event) {
-  NOTIMPLEMENTED();
-}
-
-void WindowTreeHostMac::OnDeviceScaleFactorChanged(float device_scale_factor) {
-  NOTIMPLEMENTED();
-}
-
-// static
-WindowTreeHost* WindowTreeHost::Create(const gfx::Rect& bounds) {
-  return new WindowTreeHostMac(bounds);
-}
-
-// static
-gfx::Size WindowTreeHost::GetNativeScreenSize() {
-  NOTIMPLEMENTED();
-  return gfx::Size(1024, 768);
-}
-
-}  // namespace aura