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Calling one of these APIs results in creating a WebDataRequest object to allow
calling back with the result.  This object assumed the caller had a
ThreadTaskRunnerHandle, but there's no reason callers need to have such a
handle.  Instead, allow calling any task back, using the thread or sequenced
task runner if available, or simply PostTask() if not.

Bug: 689520
Change-Id: Icf901e6de5a5b629bcf9d17617baf46a45502844
Reviewed-on: https://chromium-review.googlesource.com/578572
Commit-Queue: Peter Kasting <pkasting@chromium.org>
Reviewed-by: Robert Liao <robliao@chromium.org>
Cr-Commit-Position: refs/heads/master@{#488152}