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This reverts commit fbeb26e5.

Reason for revert: Suspected cause of https://crbug.com/1159974

Original change's description:
> Re-land #2 "Use new vulkan-deps repo for all Vulkan dependencies."
>
> Re-land #2 includes update to licenses.py and removes stale files.
>
> Re-land includes missing headers directory.
>
> This replaces several grouped dependencies with one meta-repo.
> The meta-repo will allow us to group multiple inter-dependent
> deps rolls into one single roll. This solves the problem of
> separate rollers breaking because of the inter-dependencies.
> It also allows ANGLE and Chrome to share common bits like the
> README and .gitignore files.
>
> Bug: angleproject:5390
> Bug: 1153258
> Change-Id: Ie425e232096a25711dd90e84a6d91bf3324903ab
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2595457
> Commit-Queue: Dirk Pranke <dpranke@google.com>
> Reviewed-by: Dirk Pranke <dpranke@google.com>
> Auto-Submit: Jamie Madill <jmadill@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#838196}

TBR=thakis@chromium.org,dpranke@google.com,jmadill@chromium.org,chromium-scoped@luci-project-accounts.iam.gserviceaccount.com

Change-Id: I60ab236419d36f55cf84c294f5a4e69f23c4c9c6
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: angleproject:5390
Bug: 1153258
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2595256Reviewed-by: Sean Gilhuly <sgilhuly@chromium.org>
Commit-Queue: Sean Gilhuly <sgilhuly@chromium.org>
Cr-Commit-Position: refs/heads/master@{#838227}