gn2bp: Fix cronet build for OUT_DIR set am: ad0df0c77c

Original change: https://android-review.googlesource.com/c/platform/packages/modules/Connectivity/+/2401045

Change-Id: I1ead36f90cc4aeab48b84fbb84d5c6baa92ee659
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>