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

third_party/WebKit/Source/core/css/StyleSheetContents.cpp

 /*
  * (C) 1999-2003 Lars Knoll (knoll@kde.org)
  * Copyright (C) 2004, 2006, 2007, 2012 Apple Inc. All rights reserved.
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public
  * License as published by the Free Software Foundation; either
  * version 2 of the License, or (at your option) any later version.
  *
  * This library is distributed in the hope that it will be useful,
@@ skipping 312 matching lines @@
     return;
   }
   PrefixNamespaceURIMap::AddResult result = m_namespaces.insert(prefix, uri);
   if (result.isNewEntry)
     return;
   result.storedValue->value = uri;
 }
 
 const AtomicString& StyleSheetContents::namespaceURIFromPrefix(
     const AtomicString& prefix) {
-  return m_namespaces.get(prefix);
+  return m_namespaces.at(prefix);
 }
 
 void StyleSheetContents::parseAuthorStyleSheet(
     const CSSStyleSheetResource* cachedStyleSheet,
     const SecurityOrigin* securityOrigin) {
   TRACE_EVENT1("blink,devtools.timeline", "ParseAuthorStyleSheet", "data",
                InspectorParseAuthorStyleSheetEvent::data(cachedStyleSheet));
   double startTime = monotonicallyIncreasingTime();
 
   bool isSameOriginRequest =
@@ skipping 358 matching lines @@
   visitor->trace(m_namespaceRules);
   visitor->trace(m_childRules);
   visitor->trace(m_loadingClients);
   visitor->trace(m_completedClients);
   visitor->trace(m_ruleSet);
   visitor->trace(m_referencedFromResource);
   visitor->trace(m_parserContext);
 }
 
 }  // namespace blink