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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/+/1570654Reviewed-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}