Merge "Remove unused "assistant guest mode" status bar icon." into tm-dev am:...

Merge "Remove unused "assistant guest mode" status bar icon." into tm-dev am: b1952581 am: c5277260

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/17056608

Change-Id: I8a6bcaced5b30159e75091770f1059c2667a6a74