Make 'webrtc' a static library.

webrtc/build/no_op_function.cc

 /*
  *  Copyright (c) 2016 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.
  */
 
-// TODO(zijiehe): Implement ScreenDrawerMac
-
-#include "webrtc/modules/desktop_capture/screen_drawer.h"
-
 namespace webrtc {
 
-// static
-std::unique_ptr<ScreenDrawer> ScreenDrawer::Create() {
-  return nullptr;
+// TODO(kjellander): Remove this whenever possible. GN's static_library
+// target type requires at least one object to avoid errors linking.
+
+// No-op function that can be used to compile an object necessary
+// for linking into a static library.
+int foobarbaz() {
+  return 0;
 }
 
 }  // namespace webrtc
+