Make TextDecoration an enum class.

third_party/WebKit/Source/core/style/StyleVisualData.cpp

Index: third_party/WebKit/Source/core/style/StyleVisualData.cpp
diff --git a/third_party/WebKit/Source/core/style/StyleVisualData.cpp b/third_party/WebKit/Source/core/style/StyleVisualData.cpp
index 8954188158c55c31e1de586e65890351aa999bc9..ac3b420b0ffd8aa581202cd43c0fe88e1ec50419 100644
--- a/third_party/WebKit/Source/core/style/StyleVisualData.cpp
+++ b/third_party/WebKit/Source/core/style/StyleVisualData.cpp
@@ -27,7 +27,8 @@ namespace blink {
 
 StyleVisualData::StyleVisualData()
     : has_auto_clip(true),
-      text_decoration(ComputedStyle::InitialTextDecoration()),
+      text_decoration(
+          static_cast<unsigned>(ComputedStyle::InitialTextDecoration())),
       zoom_(ComputedStyle::InitialZoom()) {}
 
 StyleVisualData::~StyleVisualData() {}