Consolidate all third party licenses in LICENSE_THIRD_PARTY.

* Add the full license to all third party files.
* Correct some entries in LICENSE_THIRD_PARTY which were missing the full
license.
* Relicense all Chromium-licensed files under WebRTC.
* Remove third_party_mods/, which is now redundant.

R=jan.linden@webrtc.org

Review URL: https://webrtc-codereview.appspot.com/1396004

git-svn-id: http://webrtc.googlecode.com/svn/trunk/webrtc@3959 4adac7df-926f-26a2-2b94-8c16560cd09d
7 files changed