Unused variable warning in Release:

warning C4189: 'MaxEnumValue' : local variable is initialized but not referenced

I'll handle fixing this.

BUG=492725
This reverts commit b25d14e4.

Change-Id: I502fc5288d5d3c48ecd43f84acdf66b7e300ad22
Reviewed-on: https://chromium-review.googlesource.com/284863Reviewed-by: Jamie Madill <jmadill@chromium.org>
Tested-by: Jamie Madill <jmadill@chromium.org>