Add testfixturetypes.h to util.gyp
Add testfixturetypes.h to util.gyp

Change-Id: I562bdca2c5c693155333a0ce168310be05b37531
Reviewed-on: https://chromium-review.googlesource.com/245741
Reviewed-by: Jamie Madill <7e492b4f1c8458024932de3ba475cbf015424c30@chromium.org>
Tested-by: Austin Kinross <4e7ea65cff3a7294234757a0f33c94811ce2f382@microsoft.com>

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