Make EFlexDirection an enum class.

third_party/WebKit/Source/core/layout/LayoutSliderContainer.cpp

 /*
  * Copyright (C) 2006, 2007, 2008, 2009 Apple Inc. All rights reserved.
  * Copyright (C) 2010 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
@@ skipping 81 matching lines @@
   // FIXME: The trackHeight should have been added before updateLogicalHeight
   // was called to avoid this hack.
   SetIntrinsicContentLogicalHeight(logical_height);
 
   LayoutBox::ComputeLogicalHeight(logical_height, logical_top, computed_values);
 }
 
 void LayoutSliderContainer::UpdateLayout() {
   HTMLInputElement* input = toHTMLInputElement(GetNode()->OwnerShadowHost());
   bool is_vertical = HasVerticalAppearance(input);
-  MutableStyleRef().SetFlexDirection(is_vertical ? kFlowColumn : kFlowRow);
+  MutableStyleRef().SetFlexDirection(is_vertical ? EFlexDirection::kColumn
+                                                 : EFlexDirection::kRow);
   TextDirection old_text_direction = Style()->Direction();
   if (is_vertical) {
     // FIXME: Work around rounding issues in RTL vertical sliders. We want them
     // to render identically to LTR vertical sliders. We can remove this work
     // around when subpixel rendering is enabled on all ports.
     MutableStyleRef().SetDirection(TextDirection::kLtr);
   }
 
   Element* thumb_element = input->UserAgentShadowRoot()->getElementById(
       ShadowElementNames::SliderThumb());
@@ skipping 37 matching lines @@
 
   // We need one-off invalidation code here because painting of the timeline
   // element does not go through style.
   // Instead it has a custom implementation in C++ code.
   // Therefore the style system cannot understand when it needs to be paint
   // invalidated.
   SetShouldDoFullPaintInvalidation();
 }
 
 }  // namespace blink