Change ui cursor identifiers to an enum class.

ui/base/cursor/cursor.cc

 // Copyright (c) 2012 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/base/cursor/cursor.h"
 
 namespace ui {
 
 Cursor::Cursor()
-    : native_type_(0),
+    : native_type_(CursorType::kNull),
       platform_cursor_(0),
-      device_scale_factor_(0.0f) {
-}
+      device_scale_factor_(0.0f) {}
 
-Cursor::Cursor(int type)
-    : native_type_(type),
-      platform_cursor_(0),
-      device_scale_factor_(0.0f) {
-}
+Cursor::Cursor(CursorType type)
+    : native_type_(type), platform_cursor_(0), device_scale_factor_(0.0f) {}
 
 Cursor::Cursor(const Cursor& cursor)
     : native_type_(cursor.native_type_),
       platform_cursor_(cursor.platform_cursor_),
       device_scale_factor_(cursor.device_scale_factor_) {
-  if (native_type_ == kCursorCustom)
+  if (native_type_ == CursorType::kCustom)
     RefCustomCursor();
 }
 
 Cursor::~Cursor() {
-  if (native_type_ == kCursorCustom)
+  if (native_type_ == CursorType::kCustom)
     UnrefCustomCursor();
 }
 
 void Cursor::SetPlatformCursor(const PlatformCursor& platform) {
-  if (native_type_ == kCursorCustom)
+  if (native_type_ == CursorType::kCustom)
     UnrefCustomCursor();
   platform_cursor_ = platform;
-  if (native_type_ == kCursorCustom)
+  if (native_type_ == CursorType::kCustom)
     RefCustomCursor();
 }
 
 void Cursor::Assign(const Cursor& cursor) {
   if (*this == cursor)
     return;
-  if (native_type_ == kCursorCustom)
+  if (native_type_ == CursorType::kCustom)
     UnrefCustomCursor();
   native_type_ = cursor.native_type_;
   platform_cursor_ = cursor.platform_cursor_;
-  if (native_type_ == kCursorCustom)
+  if (native_type_ == CursorType::kCustom)
     RefCustomCursor();
   device_scale_factor_ = cursor.device_scale_factor_;
 }
 
 }  // namespace ui