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

third_party/WebKit/Source/core/loader/FrameLoader.cpp

 /*
  * Copyright (C) 2006, 2007, 2008, 2009, 2010, 2011 Apple Inc. All rights
  * reserved.
  * Copyright (C) 2008 Nokia Corporation and/or its subsidiary(-ies)
  * Copyright (C) 2008, 2009 Torch Mobile Inc. All rights reserved.
  * (http://www.torchmobile.com/)
  * Copyright (C) 2008 Alp Toker <alp@atoker.com>
  * Copyright (C) Research In Motion Limited 2009. All rights reserved.
  * Copyright (C) 2011 Kris Jordan <krisjordan@gmail.com>
  * Copyright (C) 2011 Google Inc. All rights reserved.
@@ skipping 194 matching lines @@
   visitor->trace(m_frame);
   visitor->trace(m_progressTracker);
   visitor->trace(m_documentLoader);
   visitor->trace(m_provisionalDocumentLoader);
   visitor->trace(m_currentItem);
   visitor->trace(m_provisionalItem);
   visitor->trace(m_deferredHistoryLoad);
 }
 
 void FrameLoader::init() {
-  ResourceRequest initialRequest(KURL(ParsedURLString, emptyString()));
+  ResourceRequest initialRequest(KURL(ParsedURLString, emptyString));
   initialRequest.setRequestContext(WebURLRequest::RequestContextInternal);
   initialRequest.setFrameType(m_frame->isMainFrame()
                                   ? WebURLRequest::FrameTypeTopLevel
                                   : WebURLRequest::FrameTypeNested);
   m_provisionalDocumentLoader =
       client()->createDocumentLoader(m_frame, initialRequest, SubstituteData(),
                                      ClientRedirectPolicy::NotClientRedirect);
   m_provisionalDocumentLoader->startLoadingMainResource();
   m_frame->document()->cancelParsing();
   m_stateMachine.advanceTo(
@@ skipping 1729 matching lines @@
                          m_documentLoader ? m_documentLoader->url() : String());
   return tracedValue;
 }
 
 inline void FrameLoader::takeObjectSnapshot() const {
   TRACE_EVENT_OBJECT_SNAPSHOT_WITH_ID("loading", "FrameLoader", this,
                                       toTracedValue());
 }
 
 }  // namespace blink