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Add transparent forwarding wrappers in order to remove the "WithTraits"
suffix from the various task posting APIs. These wrappers will be
removed once all the call sites have been rewritten to also remove the
suffix.

This patch also renames methods on the TaskExecutor interface to remove
the same suffix as well as some internal ThreadPool APIs; the full code
base will be adjusted in later patches.

TBR=kkhorimoto@chromium.org

Bug: 968047
Change-Id: I429da2bdf0ad75240b3f4fc574e3b6932bf1be40
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1640650Reviewed-by: Kurt Horimoto <kkhorimoto@chromium.org>
Reviewed-by: François Doray <fdoray@chromium.org>
Commit-Queue: Sami Kyöstilä <skyostil@chromium.org>
Cr-Commit-Position: refs/heads/master@{#666224}