Implement CSS3TextDecorations runtime flag in favor of CSS3_TEXT

Source/core/page/RuntimeCSSEnabled.cpp

Index: Source/core/page/RuntimeCSSEnabled.cpp
diff --git a/Source/core/page/RuntimeCSSEnabled.cpp b/Source/core/page/RuntimeCSSEnabled.cpp
index e86a8f46226f26f6d9753d0daf9ae4d11f31d7c2..6ddf9daba9b43763e6fccc675c479d962ff04d39 100644
--- a/Source/core/page/RuntimeCSSEnabled.cpp
+++ b/Source/core/page/RuntimeCSSEnabled.cpp
@@ -64,6 +64,12 @@ static void setPropertySwitchesFromRuntimeFeatures(BoolVector& properties)
         CSSPropertyWebkitShapeOutside,
     };
     setCSSPropertiesEnabled(exclusionProperties, WTF_ARRAY_LENGTH(exclusionProperties), RuntimeEnabledFeatures::cssExclusionsEnabled());
+    CSSPropertyID css3TextDecorationProperties[] = {
+        CSSPropertyTextDecorationColor,
+        CSSPropertyTextDecorationLine,
+        CSSPropertyTextDecorationStyle,
+    };
+    setCSSPropertiesEnabled(css3TextDecorationProperties, WTF_ARRAY_LENGTH(css3TextDecorationProperties), RuntimeEnabledFeatures::css3TextDecorationsEnabled());
 
     RuntimeCSSEnabled::setCSSPropertyEnabled(CSSPropertyBackgroundBlendMode, RuntimeEnabledFeatures::cssCompositingEnabled());
     RuntimeCSSEnabled::setCSSPropertyEnabled(CSSPropertyMixBlendMode, RuntimeEnabledFeatures::cssCompositingEnabled());