Remove internal version of Opus

First step towards moving over to use Opus in Chrome.

BUG=issue982

Review URL: https://webrtc-codereview.appspot.com/937004

git-svn-id: http://webrtc.googlecode.com/svn/trunk@2990 4adac7df-926f-26a2-2b94-8c16560cd09d
diff --git a/DEPS b/DEPS
index f67b3a8..1565f18 100644
--- a/DEPS
+++ b/DEPS
@@ -57,9 +57,6 @@
   "third_party/libyuv":
     (Var("googlecode_url") % "libyuv") + "/trunk@426",
 
-  "third_party/opus/source":
-    "http://git.xiph.org/opus.git@v1.0.1",
-
   "third_party/protobuf":
     Var("chromium_trunk") + "/src/third_party/protobuf@" + Var("chromium_revision"),