Not sure if the following will solve your problem, but maybe help you get part of the way to a solution if nothing else...
The Symantec Management Client is most likely the issue (I used to contract for them and have seen similar issues).
If this is your home computer, then go to Start and type in msconfig in the Run box (where it says "Search Programs and Files") and hit enter.
System Configuration will open. Click on the Startup tab.
Uncheck the Symantec products then click "Apply" and restart.
Look at your svchost processes again and see if any are hogging the processor time.
If no improvement, go back into System Configuration and recheck the items you unchecked.
At this point, the svchost process that is complaining is probably associated with a web monitoring component, so I would temporarily disable that component and see if the process hogging continues.
If still unresolved, an excellent freeware-for-personal-use utility for examining processes in detail is IARSN TaskInfo. BTW, one of the few utilities I have paid for because it is so darn useful.
After installing, go into the help menu and activate the product, then restart as Administrator (the long button in the upper-right-hand corner).
Examine the hogging svchost.exe process and look in the lower right panel for the files it has opened, etc. so you can get more clues as how to proceed.
In general, I highly recommend looking for something less aggressive and with a better track record than the Symantec product line but that is just my personal opinion.
Hope that helps,
ClaireW
NOTE: This is not a permanent solution.
You can try installing an older version of Google Chrome and see if that works.
If this problem is introduced by a new version of Google Chrome, then it could mean there's a software conflict with something on your computer.
It might even help to read the changelogs and see what was introduced/removed/modified between the last working version of Google Chrome and the one after it. That might help pinpoint the problem.
As @harrymc suggested, you should try filing a bug report. You can do that from Chrome itself:
→ Help → Report and Issue. Or use the shortcut combination, LAlt+LShift+I
EDIT: It looks like this is a known issue. It seems very likely that the problem might be related to old software causing conflicts on your computer (as previously suggested)
You can check if a software conflict is present by visiting this page: chrome://conflicts
If you see outdated software listed there, you should update them and hopefully, that'll fix the problem.
Best Answer
What is a service?
A service is an application, no more, no less. The advantage is that a service can run without a user session. This allows things like databases, backups, the ability to login, etc to run when needed and without a user logged in.
What is svchost?
So, essentially a service which uses svchost is just calling a .dll and can do pretty much anything with the right credentials and/or permissions.
If I remember correctly, there are viruses and other malware that do hide behind the svchost process, or name the executable svchost.exe to avoid detection.