Only Constants.h remains in no namespace; but it may be addressed
in the future as well.
Bug: dawn:302
Change-Id: Ib9b9ab4b974ad1de1bb9f2302f4d24d8216f55e4
Reviewed-on: https://dawn-review.googlesource.com/c/dawn/+/132841
Kokoro: Austin Eng <enga@chromium.org>
Auto-Submit: Austin Eng <enga@chromium.org>
Reviewed-by: Loko Kung <lokokung@google.com>
Commit-Queue: Austin Eng <enga@chromium.org>