Fix //third_party/cec to not disable -Wunused-function.

ui/aura/mus/window_tree_client.cc

 // Copyright 2014 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 "ui/aura/mus/window_tree_client.h"
 
 #include <stddef.h>
 
 #include <string>
 #include <utility>
@@ skipping 46 matching lines @@
 namespace {
 
 Id MakeTransportId(ClientSpecificId client_id, ClientSpecificId local_id) {
   return (client_id << 16) | local_id;
 }
 
 inline uint16_t HiWord(uint32_t id) {
   return static_cast<uint16_t>((id >> 16) & 0xFFFF);
 }
 
-inline uint16_t LoWord(uint32_t id) {
-  return static_cast<uint16_t>(id & 0xFFFF);
-}
-
 struct WindowPortPropertyDataMus : public WindowPortPropertyData {
   std::string transport_name;
   std::unique_ptr<std::vector<uint8_t>> transport_value;
 };
 
 // Handles acknowledgment of an input event, either immediately when a nested
 // message loop starts, or upon destruction.
 class EventAckHandler : public base::MessageLoop::NestingObserver {
  public:
   explicit EventAckHandler(std::unique_ptr<EventResultCallback> ack_callback)
@@ skipping 1506 matching lines @@
   return ScheduleInFlightChange(base::MakeUnique<InFlightCaptureChange>(
       this, capture_synchronizer_.get(), window));
 }
 
 uint32_t WindowTreeClient::CreateChangeIdForFocus(WindowMus* window) {
   return ScheduleInFlightChange(base::MakeUnique<InFlightFocusChange>(
       this, focus_synchronizer_.get(), window));
 }
 
 }  // namespace aura