Add keyword_subset field template and generate text-decoration-line.

third_party/WebKit/Source/core/style/ComputedStyle.h

Index: third_party/WebKit/Source/core/style/ComputedStyle.h
diff --git a/third_party/WebKit/Source/core/style/ComputedStyle.h b/third_party/WebKit/Source/core/style/ComputedStyle.h
index 3d103410a6c3cd0663eea30d0e2d97ffa91c5402..85d59258762e2c6b4cba8e74ea5b8ec190e61306 100644
--- a/third_party/WebKit/Source/core/style/ComputedStyle.h
+++ b/third_party/WebKit/Source/core/style/ComputedStyle.h
@@ -1446,15 +1446,6 @@ class CORE_EXPORT ComputedStyle : public ComputedStyleBase<ComputedStyle>,
   }
 
   // Text decoration properties.
-  // text-decoration-line
-  static TextDecoration InitialTextDecoration() {
-    return TextDecoration::kNone;
-  }
-  TextDecoration GetTextDecoration() const {
-    return static_cast<TextDecoration>(TextDecorationInternal());
-  }
-  void SetTextDecoration(TextDecoration v) { SetTextDecorationInternal(v); }
-
   // text-decoration-color
   void SetTextDecorationColor(const StyleColor& c) {
     SET_VAR(rare_non_inherited_data_, text_decoration_color_, c);