This is no longer needed now that ANGLE uses the pinned depot_tools.
We should land this after the recipe updates to no longer use the
cache.

Patch series:
1. http://crrev.com/c/2819943
2. http://crrev.com/c/2819472
3. This CL

Bug: angleproject:5842
Change-Id: I5d166c7cd66a9d7f077c09b4149de08b22724af8

Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/2819945Reviewed-by: Yuly Novikov <ynovikov@chromium.org>
Commit-Queue: Jamie Madill <jmadill@chromium.org>