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This reverts commit 9d58d481.

Reason for revert: crbug.com/960710

Original change's description:
> [Headless] Split browser/renderer process dependencies
>
> This CL splits //headless:headless into 2 components:
> - :headless_renderer
> - :headless_non_renderer
>
> :headless_renderer is intended for child processes, and has a smaller
> footprint than :headless_non_renderer.
>
> For release builds, this reduces the  size of chrome_child.dll by about
> 9.7MB.
>
> Bug: 929408
> Change-Id: I514a1bb5604f8ab8d6c6031970b5c7a965a8393d
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1570654
> Reviewed-by: John Budorick <jbudorick@chromium.org>
> Reviewed-by: Andrey Kosyakov <caseq@chromium.org>
> Commit-Queue: Nicolas Ouellet-Payeur <nicolaso@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#656433}

TBR=caseq@chromium.org,jbudorick@chromium.org,nicolaso@chromium.org

# Not skipping CQ checks because original CL landed > 1 day ago.

Bug: 929408
Change-Id: If51e35a56b3d14c9723a50a9fe3669601c9e149f
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1600259
Commit-Queue: Nicolas Ouellet-Payeur <nicolaso@chromium.org>
Reviewed-by: Nicolas Ouellet-Payeur <nicolaso@chromium.org>
Cr-Commit-Position: refs/heads/master@{#657789}