Fixes for -Wunused-function on Linux, Android and ChromeOS

chrome/browser/chromeos/system/ash_system_tray_delegate.cc

 // Copyright (c) 2012 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 "chrome/browser/chromeos/system/ash_system_tray_delegate.h"
 
 #include <algorithm>
 #include <set>
 #include <string>
 #include <vector>
@@ skipping 184 matching lines @@
     if (ConvertToDriveOperationStatus(list[i], &status))
       results.push_back(status);
   }
   return results;
 }
 
 void BluetoothPowerFailure() {
   // TODO(sad): Show an error bubble?
 }
 
-void BluetoothDiscoveryFailure() {
-  // TODO(sad): Show an error bubble?
-}
-
 void BluetoothSetDiscoveringError() {
   LOG(ERROR) << "BluetoothSetDiscovering failed.";
 }
 
 void BluetoothDeviceConnectError(
     device::BluetoothDevice::ConnectErrorCode error_code) {
   // TODO(sad): Do something?
 }
 
 // Shows the settings sub page in the last active browser. If there is no such
@@ skipping 1015 matching lines @@
   DISALLOW_COPY_AND_ASSIGN(SystemTrayDelegate);
 };
 
 }  // namespace
 
 ash::SystemTrayDelegate* CreateSystemTrayDelegate() {
   return new chromeos::SystemTrayDelegate();
 }
 
 }  // namespace chromeos