Avoid reparsing keyframe selectors

Source/core/css/resolver/StyleResolver.cpp

Index: Source/core/css/resolver/StyleResolver.cpp
diff --git a/Source/core/css/resolver/StyleResolver.cpp b/Source/core/css/resolver/StyleResolver.cpp
index c72643e50dc939b355312672aab8077f2b6b0d7e..1126129997e9f0614e78d568cd752c00c540cc83 100644
--- a/Source/core/css/resolver/StyleResolver.cpp
+++ b/Source/core/css/resolver/StyleResolver.cpp
@@ -1185,8 +1185,7 @@ void StyleResolver::keyframeStylesForAnimation(Element* e, const RenderStyle* el
         keyframeValue.setStyle(styleForKeyframe(elementStyle, keyframe, keyframeValue));
 
         // Add this keyframe style to all the indicated key times
-        Vector<float> keys;
-        keyframe->getKeys(keys);
+        const Vector<float>& keys = keyframe->keys();
         for (size_t keyIndex = 0; keyIndex < keys.size(); ++keyIndex) {
             keyframeValue.setKey(keys[keyIndex]);
             list.insert(keyframeValue);