GitLab

The code is a subset of the library containing ECCommutativeCipher. Unused
files were removed. The rest is modified to exclude unnecessary dependencies.

The library is branched at 375be83109e10b32441483dbd0f1ac493488d197.

Bug: 986298
Change-Id: I3c15cc994b493182e2b7b7661ace2efa339f538f
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1720874Reviewed-by: Ted Choc <tedchoc@chromium.org>
Reviewed-by: Daniel Cheng <dcheng@chromium.org>
Commit-Queue: Vasilii Sukhanov <vasilii@chromium.org>
Cr-Commit-Position: refs/heads/master@{#685495}