Decoupling rtc_base_approved from Obj-C code

webrtc/rtc_base/noop.cc

Index: webrtc/rtc_base/noop.cc
diff --git a/webrtc/rtc_base/noop.cc b/webrtc/rtc_base/noop.cc
new file mode 100644
index 0000000000000000000000000000000000000000..59a41bcd1d2a5a37c1f34f6cabece6db4a4779ea
--- /dev/null
+++ b/webrtc/rtc_base/noop.cc
@@ -0,0 +1,12 @@
+/*
+ *  Copyright 2017 The WebRTC Project Authors. All rights reserved.
+ *
+ *  Use of this source code is governed by a BSD-style license
+ *  that can be found in the LICENSE file in the root of the source
+ *  tree. An additional intellectual property rights grant can be found
+ *  in the file PATENTS.  All contributing project authors may
+ *  be found in the AUTHORS file in the root of the source tree.
+ */
+
+// This is supposed to be empty because it is only needed as a workaround
+// to compile webrtc/rtc_base:rtc_base_approved.