Fix enum names in preprocessor tests. Change-Id: I6c08c43ecb2ad593119f85c05a802473348cafb7 Reviewed-on: https://chromium-review.googlesource.com/178430 Reviewed-by: Jamie Madill <jmadill@chromium.org> Reviewed-by: Nicolas Capens <nicolascapens@chromium.org> Commit-Queue: Nicolas Capens <nicolascapens@chromium.org> Tested-by: Nicolas Capens <nicolascapens@chromium.org>