Add ExceptionState checks in Document::createElement*() methods.
Add ExceptionState checks in Document::createElement*() methods.

Check if nested createElement() / createElementNS() calls have
reported exceptions and return early if so. Missing in two cases.

R=
BUG=

Review URL: https://codereview.chromium.org/112353004

git-svn-id: bf5cd6ccde378db821296732a091cfbcf5285fbd@164239 bbb929c8-8fbe-4397-9dbb-9b2b20218538

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