[EasyUnlock] Delete unused BLE code.

components/proximity_auth/ble/pref_names.cc

Index: components/proximity_auth/ble/pref_names.cc
diff --git a/components/proximity_auth/ble/pref_names.cc b/components/proximity_auth/ble/pref_names.cc
deleted file mode 100644
index ad60e867c848753dfca4532efe85de7afc2a9a08..0000000000000000000000000000000000000000
--- a/components/proximity_auth/ble/pref_names.cc
+++ /dev/null
@@ -1,16 +0,0 @@
-// Copyright 2015 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 "components/proximity_auth/ble/pref_names.h"
-
-namespace proximity_auth {
-namespace prefs {
-
-// The dictionary containing whitelisted BLE devices used by
-// proximity_auth::BluetoothLowEnergyDeviceWhitelist.
-const char kBluetoothLowEnergyDeviceWhitelist[] =
-    "proximity_auth_bluetooth_low_energy_device_whitelist";
-
-}  // namespace prefs
-}  // namespace proximity_auth