Merge "cronet: Fix remaining MissingNullability API linter issue" am: a0076a08b2 am: dea72e7643 am: 28b4d12fb2

Original change: https://android-review.googlesource.com/c/platform/packages/modules/Connectivity/+/2468862

Change-Id: I0b1f0f8691a4d1310c50976e180b92df240a55df
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>