Fix releasing textures after we kill D3D11. This bug was crashing the IncompleteTextureTest in Release mode. Fix this by releasing the textures before we free the D3D11 libraries. BUG=angle:838 Change-Id: I771e4cc6876e3529c5d26f36711dea9181e631f0 Reviewed-on: https://chromium-review.googlesource.com/231247 Tested-by: Jamie Madill <jmadill@chromium.org> Reviewed-by: Shannon Woods <shannonwoods@chromium.org>