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Most of the callers to CrOSComponentManager::Load expect the
callback to be called on the UI thread (the same as the thread from
which the method was called)- the only exception
is CrostiniManager, which does not assume the callback is called
on the UI thread, but still just relays the callback result back to
UI thread.

Currently, callbacks are run using base::PostTask, which post the
callback to the task runner. To make the behavior of the method match
the expectations, use ThreadTaskRunnerHandle::Get to get the current
task runner, and use it to asynchronously run the callback.

Bug: None
Change-Id: I9f365a11ba2634154488c580615ceede59e2a9d3
Reviewed-on: https://chromium-review.googlesource.com/1163071
Commit-Queue: Toni Barzic <tbarzic@chromium.org>
Reviewed-by: Nicholas Verne <nverne@chromium.org>
Reviewed-by: Joshua Pawlicki <waffles@chromium.org>
Cr-Commit-Position: refs/heads/master@{#580903}