Makes ECDSA the default certificate to use (generated if no other certificates are specified when constructing a peer connection, at: https://code.google.com/p/chromium/codesearch#chromium/src/third_party/webrtc/api/webrtcsessiondescriptionfactory.cc&q=webrtcsessiondescriptionfactory&sq=package:chromium&type=cs&l=191).
Makes ECDSA the default certificate to use (generated if no other certificates
are specified when constructing a peer connection, at:
https://code.google.com/p/chromium/codesearch#chromium/src/third_party/webrtc/api/webrtcsessiondescriptionfactory.cc&q=webrtcsessiondescriptionfactory&sq=package:chromium&type=cs&l=191).

This does not affect WEBRTC_BUILD_CHROMIUM builds whose ECDSA launch is handled
separately: https://crbug.com/601850 (req. @chromium acc).

BUG=chromium:611698, webrtc:5795

Review-Url: https://codereview.webrtc.org/1972383002
Cr-Original-Commit-Position: 972c6d2dc6dd5efdad1377c0d224e03eb8f276f7@{#12756}
Cr-Mirrored-From: https://chromium.googlesource.com/external/webrtc
Cr-Mirrored-Commit: 8ae8ab4e2364821eb9b4c7cf4d9718e78f79432f

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