Remove case-insensitive matching of usemap attribute.

third_party/WebKit/Source/core/dom/DocumentOrderedMap.h

 /*
  * Copyright (C) 2004, 2005, 2006, 2007, 2008, 2009, 2010 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:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
@@ skipping 43 matching lines @@
   void remove(const AtomicString&, Element*);
 
   bool contains(const AtomicString&) const;
   bool containsMultiple(const AtomicString&) const;
   // concrete instantiations of the get<>() method template
   Element* getElementById(const AtomicString&, const TreeScope*) const;
   const HeapVector<Member<Element>>& getAllElementsById(const AtomicString&,
                                                         const TreeScope*) const;
   Element* getElementByMapName(const AtomicString&, const TreeScope*) const;
   HTMLSlotElement* getSlotByName(const AtomicString&, const TreeScope*) const;
-  Element* getElementByLowercasedMapName(const AtomicString&,
-                                         const TreeScope*) const;
 
   DECLARE_TRACE();
 
 #if DCHECK_IS_ON()
   // While removing a ContainerNode, ID lookups won't be precise should the tree
   // have elements with duplicate IDs contained in the element being removed.
   // Rare trees, but ID lookups may legitimately fail across such removals;
   // this scope object informs DocumentOrderedMaps about the transitory
   // state of the underlying tree.
   class RemoveScope {
@@ skipping 41 matching lines @@
 }
 
 inline bool DocumentOrderedMap::containsMultiple(const AtomicString& id) const {
   Map::const_iterator it = m_map.find(id);
   return it != m_map.end() && it->value->count > 1;
 }
 
 }  // namespace blink
 
 #endif  // DocumentOrderedMap_h