Roll 50: Copied IDLs, PYTHON scripts from WebKit removed deleted files in WebCore

modules/mediastream/RTCPeerConnectionErrorCallback.idl

Index: modules/mediastream/RTCPeerConnectionErrorCallback.idl
diff --git a/modules/mediastream/RTCPeerConnectionErrorCallback.idl b/modules/mediastream/RTCPeerConnectionErrorCallback.idl
new file mode 100644
index 0000000000000000000000000000000000000000..c159a9fe7a7510229dec88f0d541e21283176676
--- /dev/null
+++ b/modules/mediastream/RTCPeerConnectionErrorCallback.idl
@@ -0,0 +1,10 @@
+// Copyright 2016 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+// https://w3c.github.io/webrtc-pc/#rtcpeerconnectionerrorcallback
+
+callback interface RTCPeerConnectionErrorCallback {
+    void handleEvent(DOMException exception);
+};
+