Bump to WebRTC M120 release

Some API deprecation -- ExperimentalAgc and ExperimentalNs are gone.
We're continuing to carry iSAC even though it's gone upstream, but maybe
we'll want to drop that soon.

webrtc/third_party/rnnoise/BUILD.gn

@@ -1 +1,17 @@
-IyBDb3B5cmlnaHQgMjAxOCBUaGUgQ2hyb21pdW0gQXV0aG9ycy4gQWxsIHJpZ2h0cyByZXNlcnZlZC4KIyBVc2Ugb2YgdGhpcyBzb3VyY2UgY29kZSBpcyBnb3Zlcm5lZCBieSBhIEJTRC1zdHlsZSBsaWNlbnNlIHRoYXQgY2FuIGJlCiMgZm91bmQgaW4gdGhlIExJQ0VOU0UgZmlsZS4KCmltcG9ydCgiLy90ZXN0aW5nL3Rlc3QuZ25pIikKCmdyb3VwKCJybm5vaXNlIikgewogIGRlcHMgPSBbICI6cm5uX3ZhZCIgXQp9Cgpzb3VyY2Vfc2V0KCJybm5fdmFkIikgewogIHNvdXJjZXMgPSBbCiAgICAic3JjL3Jubl9hY3RpdmF0aW9ucy5oIiwKICAgICJzcmMvcm5uX3ZhZF93ZWlnaHRzLmNjIiwKICAgICJzcmMvcm5uX3ZhZF93ZWlnaHRzLmgiLAogIF0KfQo=
+# Copyright 2018 The Chromium Authors
+# Use of this source code is governed by a BSD-style license that can be
+# found in the LICENSE file.
+
+import("//testing/test.gni")
+
+group("rnnoise") {
+  deps = [ ":rnn_vad" ]
+}
+
+source_set("rnn_vad") {
+  sources = [
+    "src/rnn_activations.h",
+    "src/rnn_vad_weights.cc",
+    "src/rnn_vad_weights.h",
+  ]
+}