Update third_party/metrics_proto

Bug: b/123780021
Change-Id: I925955518c1b483b082ddb35bf7161a1c9f3849d
Reviewed-on: https://chromium-review.googlesource.com/c/1454295
Commit-Queue: Zhuo Wang <zhuowang@google.com>
Reviewed-by: Ilya Sherman <isherman@chromium.org>
Cr-Commit-Position: refs/heads/master@{#629656}
2 files changed