Bump up version for 4.3 candidate.
Bump up version for 4.3 candidate.

NOTRY=true
TBR=jkummerow@chromium.org

Review URL: https://codereview.chromium.org/948003002

Cr-Commit-Position: 972c6d2dc6dd5efdad1377c0d224e03eb8f276f7@{#26798}

UniversalFuture/moosh,UniversalFuture/moosh,UniversalFuture/moosh,UniversalFuture/moosh