Roll src/third_party/libsrtp/ ea4ed36c8..720780acf (1 commit).

https://chromium.googlesource.com/chromium/deps/libsrtp.git/+log/ea4ed36c8fbe..720780acf8fa

$ git log ea4ed36c8..720780acf --date=short --no-merges --format='%ad %ae %s'
2016-05-03 jiayl Support header extensions encryption (RFC 6904).

BUG=webrtc:3411

Review-Url: https://codereview.chromium.org/1945723002
Cr-Commit-Position: refs/heads/master@{#391289}
1 file changed