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

third_party/WebKit/Source/core/layout/LayoutQuote.cpp

Index: third_party/WebKit/Source/core/layout/LayoutQuote.cpp
diff --git a/third_party/WebKit/Source/core/layout/LayoutQuote.cpp b/third_party/WebKit/Source/core/layout/LayoutQuote.cpp
index d5c5f0dd3d9d49c273f114bad648e53cbd8876c1..9322b7de3d930096a82e1ad1e52c0f722f5b0708 100644
--- a/third_party/WebKit/Source/core/layout/LayoutQuote.cpp
+++ b/third_party/WebKit/Source/core/layout/LayoutQuote.cpp
@@ -285,14 +285,14 @@ String LayoutQuote::computeText() const {
   switch (m_type) {
     case NO_OPEN_QUOTE:
     case NO_CLOSE_QUOTE:
-      return emptyString();
+      return emptyString;
     case CLOSE_QUOTE:
       return quotesData()->getCloseQuote(m_depth - 1).impl();
     case OPEN_QUOTE:
       return quotesData()->getOpenQuote(m_depth).impl();
   }
   ASSERT_NOT_REACHED();
-  return emptyString();
+  return emptyString;
 }
 
 const QuotesData* LayoutQuote::quotesData() const {