Remove mistaken re-add of tools/gyp

in https://chromium-review.googlesource.com/c/chromium/src/+/1302854.

TBR: grunell@chromium.org
Change-Id: Ia08618acf4aadf8111f4acb55f6cbfdd69b0222b
Reviewed-on: https://chromium-review.googlesource.com/c/1304976Reviewed-by: Scott Graham <scottmg@chromium.org>
Cr-Commit-Position: refs/heads/master@{#603514}

gyp @ d61a9397

-Subproject commit d61a9397e668fa9843c4aa7da9e79460fe590bfb