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Speculative fix for test flakiness in issues below.

As per dcheng@'s recommendations in issue 1066456, remove
CallbackWrappers:

1) For DWriteFontProxyImpl::GetUniqueNameLookupTableIfAvailable we can
immediately return by calling the callback explicitly.

2) For DWriteFontProxyImpl::GetUniqueNameLookupTable the callback is
enqueued in DWriteFontLookupTableBuilder in a
base::DeferredSequencedTaskRunner and gets run from there or does not
during shutdown - which is as expected. No need for an extra wrapper.

Bug: 1066456
Change-Id: I21891bd3cf5db7379b9e8d366cb405e7f43e8326
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2164828
Auto-Submit: Dominik Röttsches <drott@chromium.org>
Reviewed-by: Elly Fong-Jones <ellyjones@chromium.org>
Commit-Queue: Elly Fong-Jones <ellyjones@chromium.org>
Commit-Queue: Dominik Röttsches <drott@chromium.org>
Cr-Commit-Position: refs/heads/master@{#762871}