Merge "Don't destroy usb debugging dialog for emulator if usb is not...

Merge "Don't destroy usb debugging dialog for emulator if usb is not connected." into sc-dev am: b485b356 am: 2bac2746

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/14791950

Change-Id: I137ecf4ec013e6155e8bb507da37a05be0e06702