GitLab

Picks up:
r291620 vpx: Simplify intrinsic gypi files.
r291625 Attempt to let libvpx's SSE files build with clang-cl.

BUG=82385
TBR=tomfinegan@chromium.org

Review URL: https://codereview.chromium.org/502323002

Cr-Commit-Position: refs/heads/master@{#291827}