Remove FWL_WGTHITTEST_* defines in favour of enum class.

xfa/fwl/core/include/fwl_widgethit.h

Index: xfa/fwl/core/include/fwl_widgethit.h
diff --git a/xfa/fwl/core/include/fwl_widgethit.h b/xfa/fwl/core/include/fwl_widgethit.h
new file mode 100644
index 0000000000000000000000000000000000000000..102024a51099117ff3c82afad51020a9cb024031
--- /dev/null
+++ b/xfa/fwl/core/include/fwl_widgethit.h
@@ -0,0 +1,35 @@
+// Copyright 2016 PDFium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+// Original code copyright 2014 Foxit Software Inc. http://www.foxitsoftware.com
+
+#ifndef XFA_FWL_CORE_INCLUDE_FWL_WIDGETHIT_H_
+#define XFA_FWL_CORE_INCLUDE_FWL_WIDGETHIT_H_
+
+enum class FWL_WidgetHit {
+  Unknown = 0,
+  Client,
+  Left,
+  Top,
+  Right,
+  Bottom,
+  LeftTop,
+  RightTop,
+  LeftBottom,
+  RightBottom,
+  Titlebar,
+  MinBox,
+  MaxBox,
+  CloseBox,
+  HScrollBar,
+  VScrollBar,
+  Border,
+  Edge,
+  Edit,
+  HyperLink,
+  UpButton,
+  DownButton
+};
+
+#endif  // XFA_FWL_CORE_INCLUDE_FWL_WIDGETHIT_H_