Call convertToLength in CSSToStyleMap instead of having it inlined

Source/core/css/resolver/CSSToStyleMap.cpp

Index: Source/core/css/resolver/CSSToStyleMap.cpp
diff --git a/Source/core/css/resolver/CSSToStyleMap.cpp b/Source/core/css/resolver/CSSToStyleMap.cpp
index 6ba86c128d128deb4943403c34e611e5c28daa84..c9958b743032a50b2a4c21b828a9dbc11a1cd970 100644
--- a/Source/core/css/resolver/CSSToStyleMap.cpp
+++ b/Source/core/css/resolver/CSSToStyleMap.cpp
@@ -231,17 +231,8 @@ void CSSToStyleMap::mapFillXPosition(CSSPropertyID propertyID, FillLayer* layer,
         primitiveValue = pair->second();
     }
 
-    Length length;
-    if (primitiveValue->isLength())
-        length = primitiveValue->computeLength<Length>(cssToLengthConversionData());
-    else if (primitiveValue->isPercentage())
-        length = Length(primitiveValue->getDoubleValue(), Percent);
-    else if (primitiveValue->isCalculatedPercentageWithLength())
-        length = Length(primitiveValue->cssCalcValue()->toCalcValue(cssToLengthConversionData()));
-    else if (primitiveValue->isViewportPercentageLength())
-        length = primitiveValue->viewportPercentageLength();
-    else
-        return;
+    Length length = primitiveValue->convertToLength<FixedConversion | PercentConversion>(cssToLengthConversionData());
+    ASSERT(!length.isUndefined());
 
     layer->setXPosition(length);
     if (pair)
@@ -260,17 +251,8 @@ void CSSToStyleMap::mapFillYPosition(CSSPropertyID propertyID, FillLayer* layer,
         primitiveValue = pair->second();
     }
 
-    Length length;
-    if (primitiveValue->isLength())
-        length = primitiveValue->computeLength<Length>(cssToLengthConversionData());
-    else if (primitiveValue->isPercentage())
-        length = Length(primitiveValue->getDoubleValue(), Percent);
-    else if (primitiveValue->isCalculatedPercentageWithLength())
-        length = Length(primitiveValue->cssCalcValue()->toCalcValue(cssToLengthConversionData()));
-    else if (primitiveValue->isViewportPercentageLength())
-        length = primitiveValue->viewportPercentageLength();
-    else
-        return;
+    Length length = primitiveValue->convertToLength<FixedConversion | PercentConversion>(cssToLengthConversionData());
+    ASSERT(!length.isUndefined());
 
     layer->setYPosition(length);
     if (pair)