Implements CSSPropertyAPI for the text-underline-position property.

third_party/WebKit/Source/core/css/parser/CSSPropertyParser.cpp

Index: third_party/WebKit/Source/core/css/parser/CSSPropertyParser.cpp
diff --git a/third_party/WebKit/Source/core/css/parser/CSSPropertyParser.cpp b/third_party/WebKit/Source/core/css/parser/CSSPropertyParser.cpp
index 2ae352939d06b22e9ba67a8468e8ee2a06ec0fba..b4ebb79b59b6ffa2c49923692040f28a93f503be 100644
--- a/third_party/WebKit/Source/core/css/parser/CSSPropertyParser.cpp
+++ b/third_party/WebKit/Source/core/css/parser/CSSPropertyParser.cpp
@@ -3709,11 +3709,6 @@ const CSSValue* CSSPropertyParser::parseSingleValue(
       return consumeInteger(m_range, 0);
     case CSSPropertyOrder:
       return consumeInteger(m_range);
-    case CSSPropertyTextUnderlinePosition:
-      // auto | [ under || [ left | right ] ], but we only support auto | under
-      // for now
-      ASSERT(RuntimeEnabledFeatures::css3TextDecorationsEnabled());
-      return consumeIdent<CSSValueAuto, CSSValueUnder>(m_range);
     case CSSPropertyVerticalAlign:
       return consumeVerticalAlign(m_range, m_context.mode());
     case CSSPropertyShapeOutside: