scoped_ptr.h: Renames function and change namespace scope to fix conflicts with Chromium not detected by the FYI bots.

BUG=N/A
R=andrew@webrtc.org

Review URL: https://webrtc-codereview.appspot.com/23259004

git-svn-id: http://webrtc.googlecode.com/svn/trunk@7546 4adac7df-926f-26a2-2b94-8c16560cd09d