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Fix test stubbings of global XHR object (#489)

Summary:

Fixes cross-test pollution of global XHR object.

The global XHR object was being stubbed in some tests but not others. But the tests that didn't stub weren't failing because the tests that _were_ stubbing weren't being cleaned up! So some test suites were depending (implicitly) on side effects from other test files.

Issues:

partially fixes #488

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