Make TextDecoration an enum class.

third_party/WebKit/Source/modules/accessibility/AXLayoutObject.cpp

Index: third_party/WebKit/Source/modules/accessibility/AXLayoutObject.cpp
diff --git a/third_party/WebKit/Source/modules/accessibility/AXLayoutObject.cpp b/third_party/WebKit/Source/modules/accessibility/AXLayoutObject.cpp
index 767493452b9774f7dbdac06caa5575db811b27a0..311afadd67ad32f874b4360e2a05b0b9f834d8aa 100644
--- a/third_party/WebKit/Source/modules/accessibility/AXLayoutObject.cpp
+++ b/third_party/WebKit/Source/modules/accessibility/AXLayoutObject.cpp
@@ -1034,9 +1034,9 @@ TextStyle AXLayoutObject::GetTextStyle() const {
     text_style |= kTextStyleBold;
   if (style->GetFontDescription().Style() == kFontStyleItalic)
     text_style |= kTextStyleItalic;
-  if (style->GetTextDecoration() == kTextDecorationUnderline)
+  if (style->GetTextDecoration() == TextDecoration::kUnderline)
     text_style |= kTextStyleUnderline;
-  if (style->GetTextDecoration() == kTextDecorationLineThrough)
+  if (style->GetTextDecoration() == TextDecoration::kLineThrough)
     text_style |= kTextStyleLineThrough;
 
   return static_cast<TextStyle>(text_style);