Change ui cursor identifiers to an enum class.

ui/base/cursor/cursor_loader.h

Index: ui/base/cursor/cursor_loader.h
diff --git a/ui/base/cursor/cursor_loader.h b/ui/base/cursor/cursor_loader.h
index 0d53ac964e19393f8f37bef56cf2add86c02b6db..fca5e7dce44c0deffb2917201acbbb907e5cfabe 100644
--- a/ui/base/cursor/cursor_loader.h
+++ b/ui/base/cursor/cursor_loader.h
@@ -37,7 +37,7 @@ class UI_BASE_EXPORT CursorLoader {
   }
 
   // Creates a cursor from an image resource and puts it in the cursor map.
-  virtual void LoadImageCursor(int id,
+  virtual void LoadImageCursor(CursorType id,
                                int resource_id,
                                const gfx::Point& hot) = 0;
 
@@ -46,7 +46,7 @@ class UI_BASE_EXPORT CursorLoader {
   // from left to right. Also, each frame is assumed to be square
   // (width == height).
   // |frame_delay_ms| is the delay between frames in millisecond.
-  virtual void LoadAnimatedCursor(int id,
+  virtual void LoadAnimatedCursor(CursorType id,
                                   int resource_id,
                                   const gfx::Point& hot,
                                   int frame_delay_ms) = 0;