Due to bot build failures.  Partially reverts:

c09ae15c: Enable -Wextra-semi and -Wextra-semi-stmt.

TBR=jmadill@chromium.org

Bug: angleproject:3128
Change-Id: Ia3725e57d28cd899db59e1d8e760ad8ca3d5f70c
Reviewed-on: https://chromium-review.googlesource.com/c/1450659Reviewed-by: Shahbaz Youssefi <syoussefi@chromium.org>
Commit-Queue: Shahbaz Youssefi <syoussefi@chromium.org>