Refactored to provide a new PortAllocatorFactory per PeerConnection.
This refactor MediaStreamDependencyFactory to create one PortAllocatorFactory per created PeerConnection. The reason is that the PortAllocator need a valid WebFrame that belongs to the
webpage that creates the PeerConnection. The valid WebFrame will be provided in a later cl from WebKit.
Roles libjingle to revision 195.
BUG=148366,150755
TEST= existing unit tests and https://apprtc.appspot.com/?r= between two tabs.
Review URL: https://chromiumcodereview.appspot.com/
10977035
git-svn-id: svn://svn.chromium.org/chrome/trunk/src@159056 0039d316-1c4b-4281-b951-d872f2087c98