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This ports the existing native message functionality to use
CreateNativeHostSession() if the corresponding flag is enabled.

Bug: 1105319
Change-Id: Iadb4544e39ebc818f5e0309dd8e98b5fd14c801e
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2306508
Commit-Queue: Austin Tankiang <austinct@chromium.org>
Reviewed-by: Sergei Datsenko <dats@chromium.org>
Reviewed-by: Sam McNally <sammc@chromium.org>
Cr-Commit-Position: refs/heads/master@{#790694}