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This change simplifies wstring_embedded_nulls.mojom by removing the
union and making it a simple struct wrapping an uint16 array.

Bug: 911896
Change-Id: Idd4042f6a7bee8f066f6ce6477d6e5967b4d12be
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2320571
Commit-Queue: Jan Wilken Dörrie <jdoerrie@chromium.org>
Auto-Submit: Jan Wilken Dörrie <jdoerrie@chromium.org>
Reviewed-by: Joe Mason <joenotcharles@chromium.org>
Reviewed-by: Daniel Cheng <dcheng@chromium.org>
Cr-Commit-Position: refs/heads/master@{#792172}