We relied on the default destructor of RefCountedChannel to destroy its
members in reverse initialization order (deleting the DTLS wrapper
before the underlying ICE channel).
However, std::vector also may use the default assignment operator, which
performs a member-wise copy in initialization order. Which results in
deleting the ICE channel before the DTLS one. This CL fixes this by
using a vector of pointers instead of structures, and uses RefCountedObject
to handle ref-counting.
BUG=chromium:672951
Review-Url: https://codereview.webrtc.org/2571683004
Cr-Commit-Position: refs/heads/master@{#15583}
62802a1b0e