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

third_party/WebKit/Source/core/html/parser/HTMLPreloadScanner.cpp

Index: third_party/WebKit/Source/core/html/parser/HTMLPreloadScanner.cpp
diff --git a/third_party/WebKit/Source/core/html/parser/HTMLPreloadScanner.cpp b/third_party/WebKit/Source/core/html/parser/HTMLPreloadScanner.cpp
index 2b5e1553a7596536bfdd0a629646bfd35c9b186a..7ea5576e8dd2e8f9f01da5ecdb21a5561fc01cec 100644
--- a/third_party/WebKit/Source/core/html/parser/HTMLPreloadScanner.cpp
+++ b/third_party/WebKit/Source/core/html/parser/HTMLPreloadScanner.cpp
@@ -122,7 +122,7 @@ static String initiatorFor(const StringImpl* tagImpl) {
   if (match(tagImpl, videoTag))
     return videoTag.localName();
   NOTREACHED();
-  return emptyString();
+  return emptyString;
 }
 
 static bool mediaAttributeMatches(const MediaValuesCached& mediaValues,
@@ -443,7 +443,7 @@ class TokenPreloadScanner::StartTagScanner {
     // FIXME: Its not clear that this if is needed, the loader probably ignores
     // charset for image requests anyway.
     if (match(m_tagImpl, imgTag) || match(m_tagImpl, videoTag))
-      return emptyString();
+      return emptyString;
     return m_charset;
   }