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

third_party/WebKit/Source/core/html/HTMLMediaElement.cpp

 /*
  * Copyright (C) 2007, 2008, 2009, 2010, 2011, 2012, 2013 Apple 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.
  * 2. Redistributions in binary form must reproduce the above copyright
@@ skipping 696 matching lines @@
   return m_networkState;
 }
 
 String HTMLMediaElement::canPlayType(const String& mimeType) const {
   MIMETypeRegistry::SupportsType support = supportsType(ContentType(mimeType));
   String canPlay;
 
   // 4.8.10.3
   switch (support) {
     case MIMETypeRegistry::IsNotSupported:
-      canPlay = emptyString();
+      canPlay = emptyString;
       break;
     case MIMETypeRegistry::MayBeSupported:
       canPlay = "maybe";
       break;
     case MIMETypeRegistry::IsSupported:
       canPlay = "probably";
       break;
   }
 
   BLINK_MEDIA_LOG << "canPlayType(" << (void*)this << ", " << mimeType
@@ skipping 3400 matching lines @@
       kMostlyFillViewportBecomeStableSeconds, BLINK_FROM_HERE);
 }
 
 void HTMLMediaElement::viewportFillDebouncerTimerFired(TimerBase*) {
   m_mostlyFillingViewport = true;
   if (m_webMediaPlayer)
     m_webMediaPlayer->becameDominantVisibleContent(m_mostlyFillingViewport);
 }
 
 }  // namespace blink