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: I5a7f1d7f84f241b4e2c1812e012c91112feb6792
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>