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

third_party/WebKit/Source/modules/webgl/WebGLRenderingContextBase.cpp

 /*
  * Copyright (C) 2009 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
  *    notice, this list of conditions and the following disclaimer in the
@@ skipping 7539 matching lines @@
   WebGLContextEvent* event = WebGLContextEvent::create(
       EventTypeNames::webglcontextrestored, false, true, "");
   if (canvas())
     canvas()->dispatchEvent(event);
   else
     offscreenCanvas()->dispatchEvent(event);
 }
 
 String WebGLRenderingContextBase::ensureNotNull(const String& text) const {
   if (text.isNull())
-    return WTF::emptyString();
+    return WTF::emptyString;
   return text;
 }
 
 WebGLRenderingContextBase::LRUImageBufferCache::LRUImageBufferCache(
     int capacity)
     : m_buffers(wrapArrayUnique(new std::unique_ptr<ImageBuffer>[ capacity ])),
       m_capacity(capacity) {}
 
 ImageBuffer* WebGLRenderingContextBase::LRUImageBufferCache::imageBuffer(
     const IntSize& size) {
@@ skipping 267 matching lines @@
 
 void WebGLRenderingContextBase::getHTMLOrOffscreenCanvas(
     HTMLCanvasElementOrOffscreenCanvas& result) const {
   if (canvas())
     result.setHTMLCanvasElement(canvas());
   else
     result.setOffscreenCanvas(offscreenCanvas());
 }
 
 }  // namespace blink