Chromium change: https://source.chromium.org/chromium/chromium/src/+/bce682524fa13d089a8a13b4f19b048a21326009 Switch to use BaseNotificationManagerProxy for Site Chnanels This CL switches SiteChannelsManager to use BaseNotificationManagerProxy. And it also changed the getChannelStatus() call to be async. Use BaseNotificationManagerProxy allows Chrome to experiment the effect of AsyncNotificationManagerProxy when it is enabled. Bug: 242038130 Change-Id: I9b1fd060382e65f81e85971d04dac26618473184 Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/6516182