BoxBorderPainter should use computed color alpha

Source/core/style/ComputedStyle.cpp

Index: Source/core/style/ComputedStyle.cpp
diff --git a/Source/core/style/ComputedStyle.cpp b/Source/core/style/ComputedStyle.cpp
index aca2e941f6a1bf3d55f75c0322887705b9ed81db..eada38cc585ce865618040b08880b40e064fe1a7 100644
--- a/Source/core/style/ComputedStyle.cpp
+++ b/Source/core/style/ComputedStyle.cpp
@@ -1715,25 +1715,21 @@ void ComputedStyle::getBorderEdgeInfo(BorderEdge edges[], bool includeLogicalLef
     edges[BSTop] = BorderEdge(borderTopWidth(),
         visitedDependentColor(CSSPropertyBorderTopColor),
         borderTopStyle(),
-        borderTopIsTransparent(),
         horizontal || includeLogicalLeftEdge);
 
     edges[BSRight] = BorderEdge(borderRightWidth(),
         visitedDependentColor(CSSPropertyBorderRightColor),
         borderRightStyle(),
-        borderRightIsTransparent(),
         !horizontal || includeLogicalRightEdge);
 
     edges[BSBottom] = BorderEdge(borderBottomWidth(),
         visitedDependentColor(CSSPropertyBorderBottomColor),
         borderBottomStyle(),
-        borderBottomIsTransparent(),
         horizontal || includeLogicalRightEdge);
 
     edges[BSLeft] = BorderEdge(borderLeftWidth(),
         visitedDependentColor(CSSPropertyBorderLeftColor),
         borderLeftStyle(),
-        borderLeftIsTransparent(),
         !horizontal || includeLogicalLeftEdge);
 }