Moving no_op_function.cc out of webrtc/build

BUG=webrtc:7030

Review-Url: https://codereview.webrtc.org/2645223003
Cr-Commit-Position: refs/heads/master@{#16246}

webrtc/no_op_function.cc

@@ -0,0 +1,23 @@
+/*
+ *  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.
+ */
+
+namespace webrtc {
+
+// 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
+