EGLDevice: Fix edge-case memory leak. This could happen if there was an error on device init. Reported by Microsoft. BUG=None Change-Id: I059fd9308d0536b4120c28e684e37567d14b3fd5 Reviewed-on: https://chromium-review.googlesource.com/519642 Commit-Queue: Jamie Madill <jmadill@chromium.org> Reviewed-by: Geoff Lang <geofflang@chromium.org> Reviewed-by: Corentin Wallez <cwallez@chromium.org>