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a parent frame.
https://bugs.webkit.org/show_bug.cgi?id=64741

Reviewed by Adam Barth.

Test: fast/loader/document-destruction-within-unload.html

* loader/FrameLoader.cpp:
(WebCore::FrameLoader::stopLoading): Prevent unload events
    from going into infinite recursion.
(WebCore::FrameLoader::setDocumentLoader): Ensure we don't
    let set m_documentLoader to a DocumentLoader with a null Frame*.
(WebCore::FrameLoader::detachChildren): Save off a vector of
    children to detach, rather than doing it inline.

LayoutTests: Test for https://bugs.webkit.org/show_bug.cgi?id=64741.

Reviewed by Adam Barth.

* fast/loader/document-destruction-within-unload-expected.txt: Added.
* fast/loader/document-destruction-within-unload.html: Added.
* fast/loader/resources/document-destruction-within-unload-iframe.html: Added.
* fast/loader/resources/document-destruction-within-unload.svg: Added.


git-svn-id: svn://svn.chromium.org/blink/trunk@93521 bbb929c8-8fbe-4397-9dbb-9b2b20218538