Add functions rtc::AtomicOps::Load and rtc::RefCountedObject::HasOneRef

R=tommi@webrtc.org

Review URL: https://webrtc-codereview.appspot.com/40819005

Cr-Original-Commit-Position: refs/heads/master@{#8452}
Cr-Mirrored-From: https://chromium.googlesource.com/external/webrtc
Cr-Mirrored-Commit: a43fce6e02f82a0615e9ae23a794167c01945c63
2 files changed