Change ui cursor identifiers to an enum class.

ui/aura/window_tree_host_platform.cc

 // Copyright 2015 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 "ui/aura/window_tree_host_platform.h"
 
 #include <utility>
 
 #include "base/trace_event/trace_event.h"
 #include "build/build_config.h"
@@ skipping 41 matching lines @@
 #endif
 }
 
 WindowTreeHostPlatform::WindowTreeHostPlatform()
     : WindowTreeHostPlatform(nullptr) {}
 
 WindowTreeHostPlatform::WindowTreeHostPlatform(
     std::unique_ptr<WindowPort> window_port)
     : WindowTreeHost(std::move(window_port)),
       widget_(gfx::kNullAcceleratedWidget),
-      current_cursor_(ui::kCursorNull) {
-}
+      current_cursor_(ui::CursorType::kNull) {}
 
 void WindowTreeHostPlatform::SetPlatformWindow(
     std::unique_ptr<ui::PlatformWindow> window) {
   platform_window_ = std::move(window);
 }
 
 WindowTreeHostPlatform::~WindowTreeHostPlatform() {
   DestroyCompositor();
   DestroyDispatcher();
   platform_window_->Close();
@@ skipping 111 matching lines @@
   DCHECK_EQ(widget, widget_);
   widget_ = gfx::kNullAcceleratedWidget;
 }
 
 void WindowTreeHostPlatform::OnActivationChanged(bool active) {
   if (active)
     OnHostActivated();
 }
 
 }  // namespace aura