Don't rely on webrtc/base/scoped_ptr.h to include stuff for you

webrtc/base/scoped_ptr.h doesn't need to include webrtc/base/common.h
anymore, but a couple of its users were relying on it to pull in other
things for them. Fix that, and remove the now really unnecessary
webrtc/base/common.h include.

R=andrew@webrtc.org, pthatcher@webrtc.org

Review URL: https://webrtc-codereview.appspot.com/37169004

git-svn-id: http://webrtc.googlecode.com/svn/trunk/webrtc@8333 4adac7df-926f-26a2-2b94-8c16560cd09d
6 files changed