gpu_info_util: fix a DeviceInfo leak on Windows
gpu_info_util: fix a DeviceInfo leak on Windows

BUG=angleproject:1874

Change-Id: I382e306ce0c27a81e0d746fb9922fa12988927d4
Reviewed-on: https://chromium-review.googlesource.com/469230
Reviewed-by: Jamie Madill <7e492b4f1c8458024932de3ba475cbf015424c30@chromium.org>
Commit-Queue: Corentin Wallez <470c533e86f4f848c98c7e11fffc2d043494a401@chromium.org>

MSOpenTech/angle,ppy/angle,ecoal95/angle,ecoal95/angle,ecoal95/angle,ppy/angle,ecoal95/angle,MSOpenTech/angle,MSOpenTech/angle,ppy/angle,MSOpenTech/angle,ecoal95/angle,ppy/angle