Replace WTF::emptyString{16Bit}() with a static global

third_party/WebKit/Source/core/svg/SVGAnimationElement.cpp

Index: third_party/WebKit/Source/core/svg/SVGAnimationElement.cpp
diff --git a/third_party/WebKit/Source/core/svg/SVGAnimationElement.cpp b/third_party/WebKit/Source/core/svg/SVGAnimationElement.cpp
index 09b2ab8ba87171f9ac8183f44347c723c74508cc..a93258afa8a811d2cfe65c3f90397f1805a5575f 100644
--- a/third_party/WebKit/Source/core/svg/SVGAnimationElement.cpp
+++ b/third_party/WebKit/Source/core/svg/SVGAnimationElement.cpp
@@ -559,11 +559,11 @@ void SVGAnimationElement::startedActiveInterval() {
     // For to-animations the from value is the current accumulated value from
     // lower priority animations.
     // The value is not static and is determined during the animation.
-    m_animationValid = calculateFromAndToValues(emptyString(), to);
+    m_animationValid = calculateFromAndToValues(emptyString, to);
   } else if (animationMode == FromByAnimation) {
     m_animationValid = calculateFromAndByValues(from, by);
   } else if (animationMode == ByAnimation) {
-    m_animationValid = calculateFromAndByValues(emptyString(), by);
+    m_animationValid = calculateFromAndByValues(emptyString, by);
   } else if (animationMode == ValuesAnimation) {
     m_animationValid =
         m_values.size() >= 1 && (calcMode == CalcModePaced ||