Temporarily revert r8147 ("Update base/scoped_ptr.h from system_wrappers/interface/scoped_ptr.h")
Temporarily revert r8147 ("Update base/scoped_ptr.h from system_wrappers/interface/scoped_ptr.h")

Some out-of-tree code that uses base/scoped_ptr.h is defining nullptr
to 0, which causes an obvious compilation error and perhaps other
subtle problems. I'm hoping to get that sorted out and re-land this CL
soon.

TBR=andrew@webrtc.org

Review URL: https://webrtc-codereview.appspot.com/34839004

Cr-Mirrored-From: https://chromium.googlesource.com/external/webrtc
Cr-Mirrored-Commit: 6f200b5b87d6cd941f19c01f4ca83d91d13ebef0

sippet/webrtc,sippet/webrtc,sippet/webrtc,sippet/webrtc,sippet/webrtc,sippet/webrtc