Change RenderObject::style(bool) to accept an enum instead

Source/core/rendering/RenderObject.cpp

Index: Source/core/rendering/RenderObject.cpp
diff --git a/Source/core/rendering/RenderObject.cpp b/Source/core/rendering/RenderObject.cpp
index bacc6c588b996b74f4965d55e00ba5bed33a0f97..73c428c61d3fe04a42b18790b390575ad79bdcb0 100644
--- a/Source/core/rendering/RenderObject.cpp
+++ b/Source/core/rendering/RenderObject.cpp
@@ -3070,7 +3070,7 @@ void RenderObject::getTextDecorations(unsigned decorations, AppliedTextDecoratio
     Color resultColor;
     TextDecorationStyle resultStyle;
     do {
-        styleToUse = curr->style(firstlineStyle);
+        styleToUse = curr->style(firstlineStyle ? FirstLineStyle : OwnStyle);
         currDecs = styleToUse->textDecoration();
         currDecs &= decorations;
         resultColor = styleToUse->visitedDependentDecorationColor();
@@ -3102,7 +3102,7 @@ void RenderObject::getTextDecorations(unsigned decorations, AppliedTextDecoratio
 
     // If we bailed out, use the element we bailed out at (typically a <font> or <a> element).
     if (decorations && curr) {
-        styleToUse = curr->style(firstlineStyle);
+        styleToUse = curr->style(firstlineStyle ? FirstLineStyle : OwnStyle);
         resultColor = styleToUse->visitedDependentDecorationColor();
         if (decorations & TextDecorationUnderline) {
             underline.color = resultColor;