chromium-browser exit causes huge cpu use

[Seth Arnold]

Every time I quit chromium-browser, programs in this package go crazy:

$ ps auxw | grep webapps
USER PID %CPU %MEM VSZ RSS TTY STAT START TIME COMMAND
sarnold 3512 0.0 0.0 331256 4952 ? Sl 11:20 0:00 /usr/lib/libunity-webapps/unity-webapps-service
sarnold 5547 73.2 0.0 331128 12212 ? Rl 13:21 7:10 /usr/share/unity-webapps/bin/unity-webapps-messaging-host chrome-extension://pmoflmbbcfgacopiikdcpmbiellfihdg/

Note that's over seven minutes of CPU time.

I think I usually kill these things by hand; I don't recall them ever going away on their own.

Thanks

ProblemType: Bug
DistroRelease: Ubuntu 16.04
Package: unity-chromium-extension 3.2.0+15.04.20150119-0ubuntu1
ProcVersionSignature: Ubuntu 4.4.0-109.132-generic 4.4.98
Uname: Linux 4.4.0-109-generic x86_64
NonfreeKernelModules: zfs zunicode zcommon znvpair zavl
ApportVersion: 2.20.1-0ubuntu2.15
Architecture: amd64
CurrentDesktop: Unity
Date: Wed Jan 24 13:28:51 2018
InstallationDate: Installed on 2012-10-18 (1924 days ago)
InstallationMedia: Ubuntu 12.04.1 LTS "Precise Pangolin" - Release amd64 (20120823.1)
SourcePackage: unity-chromium-extension
UpgradeStatus: Upgraded to xenial on 2016-04-30 (634 days ago)