Drop const_iterator for AttributeCollection

Source/core/dom/DatasetDOMStringMap.cpp

Index: Source/core/dom/DatasetDOMStringMap.cpp
diff --git a/Source/core/dom/DatasetDOMStringMap.cpp b/Source/core/dom/DatasetDOMStringMap.cpp
index a7871bfa9aec933ff769881a2ee297e362d0b869..777be3d4746fd3a1feee5dad6b4bd928f1246849 100644
--- a/Source/core/dom/DatasetDOMStringMap.cpp
+++ b/Source/core/dom/DatasetDOMStringMap.cpp
@@ -155,8 +155,8 @@ void DatasetDOMStringMap::deref()
 void DatasetDOMStringMap::getNames(Vector<String>& names)
 {
     AttributeCollection attributes = m_element->attributes();
-    AttributeCollection::const_iterator end = attributes.end();
-    for (AttributeCollection::const_iterator it = attributes.begin(); it != end; ++it) {
+    AttributeCollection::iterator end = attributes.end();
+    for (AttributeCollection::iterator it = attributes.begin(); it != end; ++it) {
         if (isValidAttributeName(it->localName()))
             names.append(convertAttributeNameToPropertyName(it->localName()));
     }
@@ -165,8 +165,8 @@ void DatasetDOMStringMap::getNames(Vector<String>& names)
 String DatasetDOMStringMap::item(const String& name)
 {
     AttributeCollection attributes = m_element->attributes();
-    AttributeCollection::const_iterator end = attributes.end();
-    for (AttributeCollection::const_iterator it = attributes.begin(); it != end; ++it) {
+    AttributeCollection::iterator end = attributes.end();
+    for (AttributeCollection::iterator it = attributes.begin(); it != end; ++it) {
         if (propertyNameMatchesAttributeName(name, it->localName()))
             return it->value();
     }
@@ -177,8 +177,8 @@ String DatasetDOMStringMap::item(const String& name)
 bool DatasetDOMStringMap::contains(const String& name)
 {
     AttributeCollection attributes = m_element->attributes();
-    AttributeCollection::const_iterator end = attributes.end();
-    for (AttributeCollection::const_iterator it = attributes.begin(); it != end; ++it) {
+    AttributeCollection::iterator end = attributes.end();
+    for (AttributeCollection::iterator it = attributes.begin(); it != end; ++it) {
         if (propertyNameMatchesAttributeName(name, it->localName()))
             return true;
     }