On Windows we included limits.h via map.h, and it was missing
on Linux, causing build failures in the try bots.

Change-Id: I1ff7641f8265ef2127698040a31ecfa511141ec7
Reviewed-on: https://chromium-review.googlesource.com/184480Reviewed-by: Geoff Lang <geofflang@chromium.org>
Tested-by: Jamie Madill <jmadill@chromium.org>