Make EBorderStyle an enum class.

third_party/WebKit/Source/core/layout/LayoutThemeMac.mm

 /*
  * Copyright (C) 2005, 2006, 2007, 2008, 2009 Apple Inc. All rights reserved.
  * Copyright (C) 2008, 2009 Google, Inc.
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public
  * License as published by the Free Software Foundation; either
  * version 2 of the License, or (at your option) any later version.
  *
  * This library is distributed in the hope that it will be useful,
@@ skipping 863 matching lines @@
   // Use the font size to determine the intrinsic width of the control.
   SetSizeFromFont(style, SearchFieldSizes());
 }
 
 const int kSearchFieldBorderWidth = 2;
 void LayoutThemeMac::AdjustSearchFieldStyle(ComputedStyle& style) const {
   // Override border.
   style.ResetBorder();
   const short border_width = kSearchFieldBorderWidth * style.EffectiveZoom();
   style.SetBorderLeftWidth(border_width);
-  style.SetBorderLeftStyle(kBorderStyleInset);
+  style.SetBorderLeftStyle(EBorderStyle::kInset);
   style.SetBorderRightWidth(border_width);
-  style.SetBorderRightStyle(kBorderStyleInset);
+  style.SetBorderRightStyle(EBorderStyle::kInset);
   style.SetBorderBottomWidth(border_width);
-  style.SetBorderBottomStyle(kBorderStyleInset);
+  style.SetBorderBottomStyle(EBorderStyle::kInset);
   style.SetBorderTopWidth(border_width);
-  style.SetBorderTopStyle(kBorderStyleInset);
+  style.SetBorderTopStyle(EBorderStyle::kInset);
 
   // Override height.
   style.SetHeight(Length(kAuto));
   SetSearchFieldSize(style);
 
   NSControlSize control_size = ControlSizeForFont(style);
 
   // Override padding size to match AppKit text positioning.
   const int vertical_padding = 1 * style.EffectiveZoom();
   const int horizontal_padding =
@@ skipping 214 matching lines @@
 }
 
 bool LayoutThemeMac::ShouldUseFallbackTheme(const ComputedStyle& style) const {
   ControlPart part = style.Appearance();
   if (part == kCheckboxPart || part == kRadioPart)
     return style.EffectiveZoom() != 1;
   return false;
 }
 
 }  // namespace blink