Fix memory leak in FakeSSLCertificate::GetChain(), discovered by Linux Memcheck build/try bots.

TBR=hellner
BUG=

Review URL: https://webrtc-codereview.appspot.com/18969004

git-svn-id: http://webrtc.googlecode.com/svn/trunk@6809 4adac7df-926f-26a2-2b94-8c16560cd09d
(Auto)update libjingle 72389720-> 72403605

git-svn-id: http://webrtc.googlecode.com/svn/trunk@6810 4adac7df-926f-26a2-2b94-8c16560cd09d
(Auto)update libjingle 72403605-> 72407428

git-svn-id: http://webrtc.googlecode.com/svn/trunk@6811 4adac7df-926f-26a2-2b94-8c16560cd09d
(Auto)update libjingle 72407428-> 72430895

git-svn-id: http://webrtc.googlecode.com/svn/trunk@6812 4adac7df-926f-26a2-2b94-8c16560cd09d
(Auto)update libjingle 72430895-> 72442050

git-svn-id: http://webrtc.googlecode.com/svn/trunk@6813 4adac7df-926f-26a2-2b94-8c16560cd09d
(Auto)update libjingle 72442050-> 72443101

git-svn-id: http://webrtc.googlecode.com/svn/trunk@6814 4adac7df-926f-26a2-2b94-8c16560cd09d
(Auto)update libjingle 72443101-> 72446860

git-svn-id: http://webrtc.googlecode.com/svn/trunk@6815 4adac7df-926f-26a2-2b94-8c16560cd09d