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

third_party/WebKit/Source/core/dom/StyleEngine.cpp

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  *           (C) 2001 Dirk Mueller (mueller@kde.org)
  *           (C) 2006 Alexey Proskuryakov (ap@webkit.org)
  * Copyright (C) 2004, 2005, 2006, 2007, 2008, 2009, 2011, 2012 Apple Inc. All
  * rights reserved.
  * Copyright (C) 2008, 2009 Torch Mobile Inc. All rights reserved.
  * (http://www.torchmobile.com/)
  * Copyright (C) 2008, 2009, 2011, 2012 Google Inc. All rights reserved.
@@ skipping 359 matching lines @@
 
   if (m_activeTreeScopes.isEmpty())
     return documentStyleSheetCollection().activeAuthorStyleSheets();
 
   ActiveStyleSheetVector activeStyleSheets;
 
   activeStyleSheets.appendVector(
       documentStyleSheetCollection().activeAuthorStyleSheets());
   for (TreeScope* treeScope : m_activeTreeScopes) {
     if (TreeScopeStyleSheetCollection* collection =
-            m_styleSheetCollectionMap.get(treeScope))
+            m_styleSheetCollectionMap.at(treeScope))
       activeStyleSheets.appendVector(collection->activeAuthorStyleSheets());
   }
 
   // FIXME: Inspector needs a vector which has all active stylesheets.
   // However, creating such a large vector might cause performance regression.
   // Need to implement some smarter solution.
   return activeStyleSheets;
 }
 
 void StyleEngine::shadowRootRemovedFromDocument(ShadowRoot* shadowRoot) {
@@ skipping 763 matching lines @@
 }
 
 DEFINE_TRACE_WRAPPERS(StyleEngine) {
   for (auto sheet : m_injectedAuthorStyleSheets) {
     visitor->traceWrappers(sheet);
   }
   visitor->traceWrappers(m_documentStyleSheetCollection);
 }
 
 }  // namespace blink