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

third_party/WebKit/Source/platform/weborigin/KURL.cpp

 /*
  * Copyright (C) 2004, 2007, 2008, 2011, 2012 Apple Inc. All rights reserved.
  * Copyright (C) 2012 Research In Motion Limited. All rights reserved.
  * Copyright (C) 2008, 2009, 2011 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
@@ skipping 398 matching lines @@
 
 String KURL::query() const {
   if (m_parsed.query.len >= 0)
     return componentString(m_parsed.query);
 
   // Bug: https://bugs.webkit.org/show_bug.cgi?id=21015 this function returns
   // an empty string when the query is empty rather than a null (not sure
   // which is right).
   // Returns a null if the query is not specified, instead of empty.
   if (m_parsed.query.is_valid())
-    return emptyString();
+    return emptyString;
   return String();
 }
 
 String KURL::path() const {
   return componentString(m_parsed.path);
 }
 
 bool KURL::setProtocol(const String& protocol) {
   // Firefox and IE remove everything after the first ':'.
   int separatorPosition = protocol.find(':');
@@ skipping 443 matching lines @@
   m_string = AtomicString::fromUTF8(output.data(), output.length());
   initProtocolMetadata();
 }
 
 bool KURL::isSafeToSendToAnotherThread() const {
   return m_string.isSafeToSendToAnotherThread() &&
          (!m_innerURL || m_innerURL->isSafeToSendToAnotherThread());
 }
 
 }  // namespace blink