Apply source-storage limits to active sources only

Bug: 1361354
Change-Id: I858a07c708dcb96bcc4947df6bcb2e5dbb73c519
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/3883136


Reviewed-by: John Delaney <johnidel@chromium.org>
Commit-Queue: Andrew Paseltiner <apaseltiner@chromium.org>
Reviewed-by: Charlie Harrison <csharrison@chromium.org>
Cr-Commit-Position: refs/heads/main@{#1044773}