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This reverts commit e14ed878.

Reason for revert: <INSERT REASONING HERE>

Original change's description:
> Make a GN template for generate_stubs.py
> 
> Make it produce a source_set which can be depended on rather than directly including sources into the parent target.
> 
> Bug: chromium:682122
> Change-Id: I7ad9f94459f187481e656e3513eabb3e2a6f92a1
> Reviewed-on: https://chromium-review.googlesource.com/c/1348042
> Reviewed-by: Dan Sanders <sandersd@chromium.org>
> Reviewed-by: Mirko Bonadei <mbonadei@chromium.org>
> Reviewed-by: Dirk Pranke <dpranke@chromium.org>
> Commit-Queue: Oleh Prypin <oprypin@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#611117}

TBR=dpranke@chromium.org,sandersd@chromium.org,mbonadei@chromium.org,oprypin@chromium.org

Change-Id: Ic1f0262000fab30b680def6eb95ba0f55b6b9c50
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: chromium:682122
Reviewed-on: https://chromium-review.googlesource.com/c/1352039Reviewed-by: Steven Bennetts <stevenjb@chromium.org>
Commit-Queue: Steven Bennetts <stevenjb@chromium.org>
Cr-Commit-Position: refs/heads/master@{#611435}