Update XHR resource leak expectations.
Update XHR resource leak expectations.

The leaks were fixed at [1].

1: http://src.chromium.org/viewvc/blink/trunk/Source/core/fetch/ResourceLoader.cpp?r1=180749&r2=180748&pathrev=180749

BUG=402743
NOTRY=true

Review URL: https://codereview.chromium.org/501883002

git-svn-id: bf5cd6ccde378db821296732a091cfbcf5285fbd@180880 bbb929c8-8fbe-4397-9dbb-9b2b20218538

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