Delete blimp/helium and remove references to it from dependent targets

blimp/helium/syncable_common.cc

Index: blimp/helium/syncable_common.cc
diff --git a/blimp/helium/syncable_common.cc b/blimp/helium/syncable_common.cc
deleted file mode 100644
index 3555ad1114f8e853adabd32232db3e5b4f9b69d0..0000000000000000000000000000000000000000
--- a/blimp/helium/syncable_common.cc
+++ /dev/null
@@ -1,15 +0,0 @@
-// 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.
-
-#include "blimp/helium/syncable_common.h"
-
-namespace blimp {
-namespace helium {
-
-Bias ComputeBias(Peer owner, Peer running_as) {
-  return (owner == running_as ? Bias::LOCAL : Bias::REMOTE);
-}
-
-}  // namespace helium
-}  // namespace blimp