This PR condenses the namespaces in the tint/fuzzers folder.
Change-Id: I74d4db39e41d408a826bee89241c5752e1aa7df9
Reviewed-on: https://dawn-review.googlesource.com/c/dawn/+/86036
Reviewed-by: Ben Clayton <bclayton@google.com>
Auto-Submit: Dan Sinclair <dsinclair@chromium.org>
Commit-Queue: Dan Sinclair <dsinclair@chromium.org>