Make EFlexDirection an enum class.

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

 /*
  * Copyright (C) 2010 Apple 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:
  * 1.  Redistributions of source code must retain the above copyright
  *     notice, this list of conditions and the following disclaimer.
  * 2.  Redistributions in binary form must reproduce the above copyright
  *     notice, this list of conditions and the following disclaimer in the
@@ skipping 90 matching lines @@
 
   fullscreen_style->SetFontDescription(FontDescription());
   fullscreen_style->GetFont().Update(nullptr);
 
   fullscreen_style->SetDisplay(EDisplay::kFlex);
   fullscreen_style->SetJustifyContentPosition(kContentPositionCenter);
   // TODO (lajava): Since the FullScrenn layout object is anonymous, its Default
   // Alignment (align-items) value can't be used to resolve its children Self
   // Alignment 'auto' values.
   fullscreen_style->SetAlignItemsPosition(kItemPositionCenter);
-  fullscreen_style->SetFlexDirection(kFlowColumn);
+  fullscreen_style->SetFlexDirection(EFlexDirection::kColumn);
 
   fullscreen_style->SetPosition(EPosition::kFixed);
   fullscreen_style->SetLeft(Length(0, blink::kFixed));
   fullscreen_style->SetTop(Length(0, blink::kFixed));
   IntSize viewport_size = GetDocument().GetPage()->GetVisualViewport().Size();
   fullscreen_style->SetWidth(Length(viewport_size.Width(), blink::kFixed));
   fullscreen_style->SetHeight(Length(viewport_size.Height(), blink::kFixed));
 
   fullscreen_style->SetBackgroundColor(StyleColor(Color::kBlack));
 
@@ skipping 95 matching lines @@
       Parent()->SetNeedsLayoutAndPrefWidthsRecalcAndFullPaintInvalidation(
           LayoutInvalidationReason::kFullscreen);
     }
   } else {
     placeholder_->SetStyle(std::move(style));
     placeholder_->SetStyleWithWritingModeOfParent(std::move(style));
   }
 }
 
 }  // namespace blink