Remove case-insensitive matching of usemap attribute.

third_party/WebKit/Source/core/html/HTMLMapElement.cpp

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  * Copyright (C) 2004, 2005, 2006, 2007, 2010 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.
  *
@@ skipping 51 matching lines @@
 HTMLImageElement* HTMLMapElement::imageElement() {
   HTMLCollection* images = document().images();
   for (unsigned i = 0; Element* curr = images->item(i); ++i) {
     DCHECK(isHTMLImageElement(curr));
 
     // The HTMLImageElement's useMap() value includes the '#' symbol at the
     // beginning, which has to be stripped off.
     HTMLImageElement& imageElement = toHTMLImageElement(*curr);
     String useMapName =
         imageElement.getAttribute(usemapAttr).getString().substring(1);
-    if (equalIgnoringCase(useMapName, m_name))
+    if (useMapName == m_name)
       return &imageElement;
   }
 
   return nullptr;
 }
 
 void HTMLMapElement::parseAttribute(const AttributeModificationParams& params) {
   // FIXME: This logic seems wrong for XML documents.
   // Either the id or name will be used depending on the order the attributes
   // are parsed.
 
   if (params.name == idAttr || params.name == nameAttr) {
     if (params.name == idAttr) {
       // Call base class so that hasID bit gets set.
       HTMLElement::parseAttribute(params);
       if (document().isHTMLDocument())
         return;
     }
     if (isConnected())
       treeScope().removeImageMap(this);
     String mapName = params.newValue;
     if (mapName[0] == '#')
       mapName = mapName.substring(1);
-    m_name =
-        AtomicString(document().isHTMLDocument() ? mapName.lower() : mapName);
+    m_name = AtomicString(mapName);
     if (isConnected())
       treeScope().addImageMap(this);
 
     return;
   }
 
   HTMLElement::parseAttribute(params);
 }
 
 HTMLCollection* HTMLMapElement::areas() {
   return ensureCachedCollection<HTMLCollection>(MapAreas);
 }
 
 Node::InsertionNotificationRequest HTMLMapElement::insertedInto(
     ContainerNode* insertionPoint) {
   if (insertionPoint->isConnected())
     treeScope().addImageMap(this);
   return HTMLElement::insertedInto(insertionPoint);
 }
 
 void HTMLMapElement::removedFrom(ContainerNode* insertionPoint) {
   if (insertionPoint->isConnected())
     treeScope().removeImageMap(this);
   HTMLElement::removedFrom(insertionPoint);
 }
 
 }  // namespace blink