pjsip: Removed unneded WebRTC project files

Ignore-this: a255a8ea4201f5dc3615848a79d3fe7d

darcs-hash:20130711141647-56b4d-37c4544773994b6848a2814b5522a9f0bc9bff05
pjsip: Fixed echo cancelling when using 32kHz sample rate

Ignore-this: 949345b88648e1d5db6d11def18e8c8b

darcs-hash:20130715131416-56b4d-40f85f2e6cdb584d5bd0cca9e498d6ac4edae6ec
Raised core revision

Ignore-this: 3b5a3781a05e9fb99dc6c3c74f2950e7

darcs-hash:20130715114043-56b4d-dbe9266be5528f9b87b1f2963b9cbafd4b366737