Use a converter for building style value for 'transform'

third_party/WebKit/Source/core/animation/CSSTransformInterpolationType.cpp

Index: third_party/WebKit/Source/core/animation/CSSTransformInterpolationType.cpp
diff --git a/third_party/WebKit/Source/core/animation/CSSTransformInterpolationType.cpp b/third_party/WebKit/Source/core/animation/CSSTransformInterpolationType.cpp
index d0fb421574e0605dd1d17970794d47d9f0342ee5..93cb3b8ac3fda13560f87df731c53a298eec3a4f 100644
--- a/third_party/WebKit/Source/core/animation/CSSTransformInterpolationType.cpp
+++ b/third_party/WebKit/Source/core/animation/CSSTransformInterpolationType.cpp
@@ -201,9 +201,8 @@ InterpolationValue CSSTransformInterpolationType::maybeConvertValue(
       conversionCheckers.append(std::move(lengthUnitsChecker));
   }
 
-  TransformOperations transform;
-  TransformBuilder::createTransformOperations(
-      value, state.cssToLengthConversionData(), transform);
+  TransformOperations transform = TransformBuilder::createTransformOperations(
+      value, state.cssToLengthConversionData());
   return convertTransform(std::move(transform));
 }