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This CL updates the SPIRV-Tools DEPS entry. This requires adding a
SPIRV-Headers third_party dependency as the headers are no-longer part
of SPIRV-Tools.

The BUILD.gn file for SPIRV-Tools is added directly to the SPIRV-Tools
repo and so third_party/SPIRV-Tools/BUILD.gn can be removed. The
SPIRV-Tools build contains fuzzing targets which are enabled with this
change.

Change-Id: I9181a1b50c1f08bbe4e68dff0e00b927d297745f
Reviewed-on: https://chromium-review.googlesource.com/1142028
Commit-Queue: dsinclair <dsinclair@chromium.org>
Reviewed-by: Antoine Labour <piman@chromium.org>
Reviewed-by: Jochen Eisinger <jochen@chromium.org>
Cr-Commit-Position: refs/heads/master@{#579914}