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Removed access to the native XHR object used by the API.

This is a larger change than one might expect for two reasons: First,
because the native XHR object only allows the response content to be
retrieved while the onreadystatechange handler is executing, and
second, because the unit test for dns_blackhole_checker.js relied on
synchronous semantics which cannot be duplicated with promises because
when a promise is resolved, its "then" handlers are not called until
the next event cycle.

Review URL: https://codereview.chromium.org/1003433002

Cr-Commit-Position: refs/heads/master@{#321608}