Merge 102602 - Source/WebCore: A SubresourceLoader in the middle of revalidating

Merge 102602 - Source/WebCore: A SubresourceLoader in the middle of revalidating
a resource should be treated as finishing (similar to
didFinishLoading and didFail) to ensure that willCancel()
doesn't declare the revalidation as having failed reentrantly.
https://bugs.webkit.org/show_bug.cgi?id=72762

Reviewed by Adam Barth.

Test: http/tests/cache/cancel-during-revalidation-succeeded.html

* loader/SubresourceLoader.cpp:
(WebCore::SubresourceLoader::didReceiveResponse):

LayoutTests: Test for https://bugs.webkit.org/show_bug.cgi?id=72762

Reviewed by Adam Barth.

* http/tests/cache/cancel-during-revalidation-succeeded-expected.txt: Added.
* http/tests/cache/cancel-during-revalidation-succeeded.html: Added.
* http/tests/cache/resources/stylesheet304.php: Added.


TBR=japhet@chromium.org
Committed: http://src.chromium.org/viewvc/chrome?view=rev&revision=102614