Drop const_iterator for AttributeCollection

Source/core/html/HTMLObjectElement.cpp

Index: Source/core/html/HTMLObjectElement.cpp
diff --git a/Source/core/html/HTMLObjectElement.cpp b/Source/core/html/HTMLObjectElement.cpp
index 44b3a51655a1928f6901f6abc5eb8878d7ac0407..34be9bfb75b9c9ddf00d1ca7a3dfd412055e41c2 100644
--- a/Source/core/html/HTMLObjectElement.cpp
+++ b/Source/core/html/HTMLObjectElement.cpp
@@ -188,8 +188,8 @@ void HTMLObjectElement::parametersForPlugin(Vector<String>& paramNames, Vector<S
 
     // Turn the attributes of the <object> element into arrays, but don't override <param> values.
     AttributeCollection attributes = this->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) {
         const AtomicString& name = it->name().localName();
         if (!uniqueParamNames.contains(name.impl())) {
             paramNames.append(name.string());