Rename UseCounter::CSPWithUnsafeDynamic to UseCounter::CSPWithStrictDynamic.

This change is due to the renaming of 'unsafe-dynamic' to
'strict-dynamic' (https://codereview.chromium.org/2082613002/).

R=mkwst@chromium.org
BUG=589380

Review-Url: https://codereview.chromium.org/2080203003
Cr-Commit-Position: refs/heads/master@{#400990}
3 files changed