Add testfixturetypes.h to util.gyp Change-Id: I562bdca2c5c693155333a0ce168310be05b37531 Reviewed-on: https://chromium-review.googlesource.com/245741 Reviewed-by: Jamie Madill <jmadill@chromium.org> Tested-by: Austin Kinross <aukinros@microsoft.com>