Change ui cursor identifiers to an enum class.

ui/base/cursor/cursor_loader_ozone.h

Index: ui/base/cursor/cursor_loader_ozone.h
diff --git a/ui/base/cursor/cursor_loader_ozone.h b/ui/base/cursor/cursor_loader_ozone.h
index 6cd67dc6f0b490940e13f13b1a633a83c484b062..00a23283d5855bd4d3ae36d9d716a02693d7eb75 100644
--- a/ui/base/cursor/cursor_loader_ozone.h
+++ b/ui/base/cursor/cursor_loader_ozone.h
@@ -19,10 +19,10 @@ class UI_BASE_EXPORT CursorLoaderOzone : public CursorLoader {
   ~CursorLoaderOzone() override;
 
   // CursorLoader overrides:
-  void LoadImageCursor(int id,
+  void LoadImageCursor(CursorType id,
                        int resource_id,
                        const gfx::Point& hot) override;
-  void LoadAnimatedCursor(int id,
+  void LoadAnimatedCursor(CursorType id,
                           int resource_id,
                           const gfx::Point& hot,
                           int frame_delay_ms) override;
@@ -31,7 +31,7 @@ class UI_BASE_EXPORT CursorLoaderOzone : public CursorLoader {
 
  private:
   // Pointers are owned by ResourceBundle and must not be freed here.
-  typedef std::map<int, PlatformCursor> ImageCursorMap;
+  typedef std::map<CursorType, PlatformCursor> ImageCursorMap;
   ImageCursorMap cursors_;
 
   DISALLOW_COPY_AND_ASSIGN(CursorLoaderOzone);