Reland "iwa: Bundle the key distribution component together with Chrome"

This is a reland of commit a894856f2f1d3f0122d0bc20aead90dacfbec65b

Build nondeterminism addressed by crrev.com/c/6031352.

Original change's description:
> iwa: Bundle the key distribution component together with Chrome
>
> Note that changes to platform-specific installers are required to make
> this actually work -- this CL alone is not sufficient!
>
> Bug: 359599875
> Change-Id: I9b86431c2fa7bd6084d2e9d69cfed70b7977a6a0
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/5999988
> Reviewed-by: Joshua Pawlicki <waffles@chromium.org>
> Reviewed-by: Avi Drissman <avi@chromium.org>
> Reviewed-by: Robbie McElrath <rmcelrath@chromium.org>
> Commit-Queue: Andrew Rayskiy <greengrape@google.com>
> Cr-Commit-Position: refs/heads/main@{#1383807}

Bug: 359599875
Change-Id: Ieec5323b2e5412030678398517fbfe07c6609932
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/6032130
Reviewed-by: Robbie McElrath <rmcelrath@chromium.org>
Commit-Queue: Andrew Rayskiy <greengrape@google.com>
Reviewed-by: Avi Drissman <avi@chromium.org>
Cr-Commit-Position: refs/heads/main@{#1384439}