Use C++11 features in core/html

Source/core/html/HTMLFormElement.cpp

Index: Source/core/html/HTMLFormElement.cpp
diff --git a/Source/core/html/HTMLFormElement.cpp b/Source/core/html/HTMLFormElement.cpp
index 880b9adeb8a9de71c2e87bc0b52c31361df87af0..25a36a461d50b648b13c62d75d0e3dd8ce3985fb 100644
--- a/Source/core/html/HTMLFormElement.cpp
+++ b/Source/core/html/HTMLFormElement.cpp
@@ -790,10 +790,9 @@ void HTMLFormElement::removeFromPastNamesMap(HTMLElement& element)
 {
     if (!m_pastNamesMap)
         return;
-    PastNamesMap::iterator end = m_pastNamesMap->end();
-    for (PastNamesMap::iterator it = m_pastNamesMap->begin(); it != end; ++it) {
-        if (it->value == &element) {
-            it->value = nullptr;
+    for (auto& it : *m_pastNamesMap) {
+        if (it.value == &element) {
+            it.value = nullptr;
             // Keep looping. Single element can have multiple names.
         }
     }