Revert of bluetooth: Use WebBluetoothDeviceId instead of string

content/common/bluetooth/web_bluetooth_device_id.cc

-// 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.
-
-#include "content/common/bluetooth/web_bluetooth_device_id.h"
-
-#include "base/base64.h"
-#include "base/strings/string_util.h"
-#include "crypto/random.h"
-
-namespace content {
-
-namespace {
-
-enum { kDeviceIdLength = 16 /* 128 bits */ };
-
-}  // namespace
-
-WebBluetoothDeviceId::WebBluetoothDeviceId() {}
-
-WebBluetoothDeviceId::WebBluetoothDeviceId(std::string device_id)
-    : device_id_(std::move(device_id)) {
-  DCHECK(IsValid(device_id_));
-}
-
-WebBluetoothDeviceId::~WebBluetoothDeviceId() {}
-
-const std::string& WebBluetoothDeviceId::str() const {
-  DCHECK(IsValid(device_id_));
-  return device_id_;
-}
-
-// static
-WebBluetoothDeviceId WebBluetoothDeviceId::Create() {
-  std::string bytes(
-      kDeviceIdLength + 1 /* to avoid bytes being reallocated by WriteInto */,
-      '\0');
-
-  crypto::RandBytes(base::WriteInto(&bytes /* str */,
-                                    kDeviceIdLength + 1 /* length_with_null */),
-                    kDeviceIdLength);
-
-  base::Base64Encode(bytes, &bytes);
-
-  return WebBluetoothDeviceId(std::move(bytes));
-}
-
-// static
-bool WebBluetoothDeviceId::IsValid(const std::string& device_id) {
-  std::string decoded;
-  if (!base::Base64Decode(device_id, &decoded)) {
-    return false;
-  }
-
-  if (decoded.size() != kDeviceIdLength) {
-    return false;
-  }
-
-  // When base64-encoding a 128bit string, only the two MSB are used for
-  // the 3rd-to-last character. Because of this, the 3rd-to-last character
-  // can only be one of this four characters.
-  if (!(device_id[device_id.size() - 3] == 'A' ||
-        device_id[device_id.size() - 3] == 'Q' ||
-        device_id[device_id.size() - 3] == 'g' ||
-        device_id[device_id.size() - 3] == 'w')) {
-    return false;
-  }
-
-  return true;
-}
-
-bool WebBluetoothDeviceId::operator==(
-    const WebBluetoothDeviceId& device_id) const {
-  return str() == device_id.str();
-}
-
-bool WebBluetoothDeviceId::operator!=(
-    const WebBluetoothDeviceId& device_id) const {
-  return !(*this == device_id);
-}
-
-std::ostream& operator<<(std::ostream& out,
-                         const WebBluetoothDeviceId& device_id) {
-  return out << device_id.str();
-}
-
-}  // namespace content