Revert of bluetooth: Use WebBluetoothDeviceId instead of string

content/common/bluetooth/web_bluetooth_device_id.h

-// 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.
-
-#ifndef CONTENT_COMMON_BLUETOOTH_WEB_BLUETOOTH_DEVICE_ID_H_
-#define CONTENT_COMMON_BLUETOOTH_WEB_BLUETOOTH_DEVICE_ID_H_
-
-#include <string>
-
-#include "content/common/content_export.h"
-
-namespace content {
-
-// Used to uniquely identify a Bluetooth Device for an Origin.
-// A WebBluetoothDeviceId is generated by base64-encoding a 128bit
-// string.
-class CONTENT_EXPORT WebBluetoothDeviceId {
- public:
-  // Default constructor that creates an invalid id. We implement it so that
-  // instances of this class in a container, e.g. std::unordered_map, can be
-  // accessed through the [] operator. Trying to call any function of the
-  // resulting object will DCHECK-fail.
-  WebBluetoothDeviceId();
-
-  // DCHECKS that |device_id| is valid.
-  explicit WebBluetoothDeviceId(std::string device_id);
-  ~WebBluetoothDeviceId();
-
-  // Returns the string that represents this WebBluetoothDeviceId.
-  const std::string& str() const;
-
-  // The returned WebBluetoothDeviceId is generated by creating a random 128bit
-  // string and base64-encoding it.
-  static WebBluetoothDeviceId Create();
-
-  // Returns true if base64-decoding |device_id| results in a 128bit string.
-  static bool IsValid(const std::string& device_id);
-
-  bool operator==(const WebBluetoothDeviceId& device_id) const;
-  bool operator!=(const WebBluetoothDeviceId& device_id) const;
-
- private:
-  std::string device_id_;
-};
-
-// This is required by gtest to print a readable output on test failures.
-CONTENT_EXPORT std::ostream& operator<<(std::ostream& out,
-                                        const WebBluetoothDeviceId& device_id);
-
-struct WebBluetoothDeviceIdHash {
-  size_t operator()(const WebBluetoothDeviceId& device_id) const {
-    return std::hash<std::string>()(device_id.str());
-  }
-};
-
-}  // namespace content
-
-#endif  // CONTENT_COMMON_BLUETOOTH_WEB_BLUETOOTH_DEVICE_ID_H_