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

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

Change-Id: I6a3ccf7a9a33ea96c99e3447e13ef8d2a914d830
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>