Squashed commit of the following:

commit 9254c845d7c82976fd4b8be406ce4b17eeb0e119
Author: Andreas Huber <andih@google.com>
Date:   Fri Dec 3 15:26:12 2010 -0800

    Remove obsolete code from the cached data source.

    Change-Id: I794b986ac8977cbc834dff189221a636ba564e36

commit 2ee33711064c58c53ba65ed9e63dd4b01ec2380e
Author: Andreas Huber <andih@google.com>
Date:   Fri Dec 3 15:23:13 2010 -0800

    LiveSource is dead, long live LiveSession.

    Change-Id: Ibcd0731ecf9c94f0b3e5db3d53d012d9da2a1c66

commit 9eabb2c3cd8571ab859bdeae0aa7f655c414d8fa
Author: Andreas Huber <andih@google.com>
Date:   Fri Dec 3 12:49:31 2010 -0800

    Respect explicitly signalled discontinuities.

    Change-Id: I3c0c16a2de7a99742d25db7d1b2ff0258de52271

commit 7f7f7b6b906b6ece6e4d43af7fd5f494e805c5e5
Author: Andreas Huber <andih@google.com>
Date:   Fri Dec 3 11:45:57 2010 -0800

    Better protection against syncword emulation in AAC ADTS content.

    Change-Id: I867e80a4556dd46d24ab3e781177c248a5221719

commit fe765766582efcc350aed01135ea603576adccf6
Author: Andreas Huber <andih@google.com>
Date:   Fri Dec 3 09:15:59 2010 -0800

    New implementation of http live driving code.

    Change-Id: I31ddf3d6a0d5929b121be704a2b9c3d6775f7737

Change-Id: Id8d1829c8fcb173756965013f848c1d426ef1048