Google Style Guide now prefers references to pointers because references
are non-nullable.
See https://google.github.io/styleguide/cppguide.html#Inputs_and_Outputs which now says:
> Non-optional input parameters should usually be values or const references, while non-optional
> output and input/output parameters should usually be references (which cannot be null).
This means runtime/references lint is outdated and can be disabled.
R=kustermann@google.com
Change-Id: Idec650603982387c000671aad7d77727a008f5cd
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/279388
Reviewed-by: Martin Kustermann <kustermann@google.com>
Commit-Queue: Slava Egorov <vegorov@google.com>
