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

third_party/WebKit/Source/modules/accessibility/AXObject.cpp

 /*
  * Copyright (C) 2008, 2009, 2011 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
@@ skipping 1638 matching lines @@
 
 AccessibilityRole AXObject::ariaRoleToWebCoreRole(const String& value) {
   ASSERT(!value.isEmpty());
 
   static const ARIARoleMap* roleMap = createARIARoleMap();
 
   Vector<String> roleVector;
   value.split(' ', roleVector);
   AccessibilityRole role = UnknownRole;
   for (const auto& child : roleVector) {
-    role = roleMap->get(child);
+    role = roleMap->at(child);
     if (role)
       return role;
   }
 
   return role;
 }
 
 bool AXObject::isInsideFocusableElementOrARIAWidget(const Node& node) {
   const Node* curNode = &node;
   do {
@@ skipping 92 matching lines @@
 }
 
 DEFINE_TRACE(AXObject) {
   visitor->trace(m_children);
   visitor->trace(m_parent);
   visitor->trace(m_cachedLiveRegionRoot);
   visitor->trace(m_axObjectCache);
 }
 
 }  // namespace blink