[css-grid] Fix performance regression in grid layout

third_party/WebKit/Source/core/css/ComputedStyleCSSValueMapping.cpp

Index: third_party/WebKit/Source/core/css/ComputedStyleCSSValueMapping.cpp
diff --git a/third_party/WebKit/Source/core/css/ComputedStyleCSSValueMapping.cpp b/third_party/WebKit/Source/core/css/ComputedStyleCSSValueMapping.cpp
index 637cd049db5789036fb694b2256cb606efe0902a..aa9846980de9bf16603cf9bc472aef975b43143d 100644
--- a/third_party/WebKit/Source/core/css/ComputedStyleCSSValueMapping.cpp
+++ b/third_party/WebKit/Source/core/css/ComputedStyleCSSValueMapping.cpp
@@ -719,7 +719,7 @@ static CSSValue* specifiedValueForGridTrackSize(const GridTrackSize& trackSize,
 {
     switch (trackSize.type()) {
     case LengthTrackSizing:
-        return specifiedValueForGridTrackBreadth(trackSize.length(), style);
+        return specifiedValueForGridTrackBreadth(trackSize.minTrackBreadth(), style);
     case MinMaxTrackSizing: {
         auto* minMaxTrackBreadths = CSSFunctionValue::create(CSSValueMinmax);
         minMaxTrackBreadths->append(*specifiedValueForGridTrackBreadth(trackSize.minTrackBreadth(), style));
@@ -727,7 +727,7 @@ static CSSValue* specifiedValueForGridTrackSize(const GridTrackSize& trackSize,
         return minMaxTrackBreadths;
     } case FitContentTrackSizing: {
         auto* fitContentTrackBreadth = CSSFunctionValue::create(CSSValueFitContent);
-        fitContentTrackBreadth->append(*specifiedValueForGridTrackBreadth(trackSize.length(), style));
+        fitContentTrackBreadth->append(*specifiedValueForGridTrackBreadth(trackSize.fitContentTrackBreadth(), style));
         return fitContentTrackBreadth;
     }
     }