Migrate WTF::HashMap::get() to ::at()

third_party/WebKit/Source/platform/mhtml/MHTMLArchive.cpp

 /*
  * Copyright (C) 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:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 248 matching lines @@
 
 void MHTMLArchive::addSubresource(ArchiveResource* resource) {
   const KURL& url = resource->url();
   m_subresources.set(url, resource);
   KURL cidURI = MHTMLParser::convertContentIDToURI(resource->contentID());
   if (cidURI.isValid())
     m_subresources.set(cidURI, resource);
 }
 
 ArchiveResource* MHTMLArchive::subresourceForURL(const KURL& url) const {
-  return m_subresources.get(url.getString());
+  return m_subresources.at(url.getString());
 }
 
 DEFINE_TRACE(MHTMLArchive) {
   visitor->trace(m_mainResource);
   visitor->trace(m_subresources);
 }
 
 }  // namespace blink