Convert some of WebCore/dom over to range-for loops
https://bugs.webkit.org/show_bug.cgi?id=126250

Reviewed by Andreas Kling.

* dom/ContainerNode.cpp:
* dom/Document.cpp:
* dom/MutationObserver.cpp:
* dom/MutationObserverInterestGroup.cpp:
* dom/MutationObserverRegistration.cpp:
* dom/Node.cpp:
* dom/NodeRareData.h:
* dom/ScriptExecutionContext.cpp:
* dom/WebKitNamedFlow.cpp:


git-svn-id: http://svn.webkit.org/repository/webkit/trunk@161096 268f45cc-cd09-0410-ab3c-d52691b4dbfc