chromeos: Remove unused NFC D-Bus client library

device/nfc/nfc_adapter_factory.cc

-// Copyright 2013 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 "device/nfc/nfc_adapter_factory.h"
-
-#include "base/lazy_instance.h"
-#include "base/logging.h"
-#include "base/memory/weak_ptr.h"
-#include "build/build_config.h"
-
-#if defined(OS_CHROMEOS)
-#include "device/nfc/nfc_adapter_chromeos.h"
-#endif
-
-namespace device {
-
-namespace {
-
-// Shared default adapter instance, we don't want to keep this class around
-// if nobody is using it so use a WeakPtr and create the object when needed;
-// since Google C++ Style (and clang's static analyzer) forbids us having
-// exit-time destructors we use a leaky lazy instance for it.
-base::LazyInstance<base::WeakPtr<device::NfcAdapter> >::Leaky
-    default_adapter = LAZY_INSTANCE_INITIALIZER;
-
-}  // namespace
-
-// static
-bool NfcAdapterFactory::IsNfcAvailable() {
-#if defined(OS_CHROMEOS)
-  return true;
-#else
-  return false;
-#endif
-}
-
-// static
-void NfcAdapterFactory::GetAdapter(const AdapterCallback&  callback) {
-  if (!IsNfcAvailable()) {
-    LOG(WARNING) << "NFC is not available on the current platform.";
-    return;
-  }
-  if (!default_adapter.Get().get()) {
-#if defined(OS_CHROMEOS)
-    chromeos::NfcAdapterChromeOS* new_adapter =
-        new chromeos::NfcAdapterChromeOS();
-    default_adapter.Get() = new_adapter->weak_ptr_factory_.GetWeakPtr();
-#endif
-  }
-  if (default_adapter.Get()->IsInitialized())
-    callback.Run(scoped_refptr<NfcAdapter>(default_adapter.Get().get()));
-}
-
-}  // namespace device