Merge "cronet: Fix some MissingNullability API lineter issues" am: 8725ce2d0e am: 4115bb07ea

Original change: https://android-review.googlesource.com/c/platform/packages/modules/Connectivity/+/2412092

Change-Id: I066e6d0c5b0827229159f88232620b24a4ad0779
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>