Replace assert() with static_assert() if the condition is evaluatable at
compile time.

The condition of static_assert() is evaluated at compile time which is safer and
more efficient.

Note that static_assert() requires C++11.

The changes were generated by the misc-static-assert ClangTidy check by alexfh@google.com

R=tommi@webrtc.org

Review URL: https://webrtc-codereview.appspot.com/51019004

Cr-Commit-Position: refs/heads/master@{#9231}
5 files changed