Fix decode error in NACK/FEC mode after network glitch.
Fix decode error in NACK/FEC mode after network glitch.

Caused when recyclingframes until the next key frame to
regain frame buffers when the jitter buffer is full.

BUG=http://code.google.com/p/webrtc/issues/detail?id=225
TEST=

Review URL: http://webrtc-codereview.appspot.com/350005

git-svn-id: 9b397c5dfe384c04b1b200d5305b653241000171@1390 4adac7df-926f-26a2-2b94-8c16560cd09d

lukeweber/webrtc-src-override,lukeweber/webrtc-src-override,lukeweber/webrtc-src-override,lukeweber/webrtc-src-override,lukeweber/webrtc-src-override,lukeweber/webrtc-src-override,lukeweber/webrtc-src-override