Change ui cursor identifiers to an enum class.

ui/aura/window_tree_host.cc

 // Copyright (c) 2013 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.h"
 
 #include "base/threading/thread_task_runner_handle.h"
 #include "base/trace_event/trace_event.h"
 #include "ui/aura/client/capture_client.h"
 #include "ui/aura/client/cursor_client.h"
@@ skipping 202 matching lines @@
     compositor()->SetVisible(false);
 }
 
 ////////////////////////////////////////////////////////////////////////////////
 // WindowTreeHost, protected:
 
 WindowTreeHost::WindowTreeHost() : WindowTreeHost(nullptr) {}
 
 WindowTreeHost::WindowTreeHost(std::unique_ptr<WindowPort> window_port)
     : window_(new Window(nullptr, std::move(window_port))),
-      last_cursor_(ui::kCursorNull),
+      last_cursor_(ui::CursorType::kNull),
       input_method_(nullptr),
       owned_input_method_(false) {}
 
 void WindowTreeHost::DestroyCompositor() {
   compositor_.reset();
 }
 
 void WindowTreeHost::DestroyDispatcher() {
   delete window_;
   window_ = nullptr;
@@ skipping 109 matching lines @@
   client::CursorClient* cursor_client = client::GetCursorClient(window());
   if (cursor_client) {
     const display::Display& display =
         display::Screen::GetScreen()->GetDisplayNearestWindow(window());
     cursor_client->SetDisplay(display);
   }
   dispatcher()->OnCursorMovedToRootLocation(root_location);
 }
 
 }  // namespace aura