Use C++11 features in core/html

Source/core/html/HTMLFrameOwnerElement.cpp

Index: Source/core/html/HTMLFrameOwnerElement.cpp
diff --git a/Source/core/html/HTMLFrameOwnerElement.cpp b/Source/core/html/HTMLFrameOwnerElement.cpp
index 29e31eca22117163abe05319a48612fe0200a89f..d26ebf0b659ff8873ba60fc8662d503c4823c29c 100644
--- a/Source/core/html/HTMLFrameOwnerElement.cpp
+++ b/Source/core/html/HTMLFrameOwnerElement.cpp
@@ -62,11 +62,10 @@ void HTMLFrameOwnerElement::UpdateSuspendScope::performDeferredWidgetTreeOperati
 {
     WidgetToParentMap map;
     widgetNewParentMap().swap(map);
-    WidgetToParentMap::iterator end = map.end();
-    for (WidgetToParentMap::iterator it = map.begin(); it != end; ++it) {
-        Widget* child = it->key.get();
+    for (const auto& widget : map) {
+        Widget* child = widget.key.get();
         FrameView* currentParent = toFrameView(child->parent());
-        FrameView* newParent = it->value;
+        FrameView* newParent = widget.value;
         if (newParent != currentParent) {
             if (currentParent)
                 currentParent->removeChild(child);