Added Chrome+WebRTC bots based on Chrome scripts, for all platforms.

Also removed the old Linux Chrome and Chrome Bloat bots from utils.py.

Some of these changes may seem a bit confusing and messy but they must be considered a step on the way to moving away from our inheritance based Factories into the style Chrome users, where most configuration is in the .cfg files, factory setup is in the factories and step details are put into the commands-files.

BUG=None
TEST=Tested with local master and production slaves.

Review URL: https://webrtc-codereview.appspot.com/581006

git-svn-id: http://webrtc.googlecode.com/svn/trunk@2238 4adac7df-926f-26a2-2b94-8c16560cd09d
10 files changed