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

Cr-Original-Commit-Position: 972c6d2dc6dd5efdad1377c0d224e03eb8f276f7@{#8333}
Cr-Mirrored-From: https://chromium.googlesource.com/external/webrtc
Cr-Mirrored-Commit: 11426dc719f24ece3246fd8fb24ae073c49b42ed

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