Replace dbus::BluetoothDeviceClient names with constants from cros_system_api.

device/bluetooth/dbus/bluetooth_device_client.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/bluetooth/dbus/bluetooth_device_client.h"
 
 #include <memory>
 #include <utility>
 
 #include "base/bind.h"
@@ skipping 426 matching lines @@
                                  const ConnectionParameters& conn_params,
                                  const base::Closure& callback,
                                  const ErrorCallback& error_callback) override {
     dbus::ObjectProxy* object_proxy =
         object_manager_->GetObjectProxy(object_path);
     if (!object_proxy) {
       error_callback.Run(kUnknownDeviceError, "");
       return;
     }
 
-    // TODO(crbug.com/725367): Use constants in cros_system_api once it is
-    // rolled.
     dbus::MethodCall method_call(
         bluetooth_plugin_device::kBluetoothPluginInterface,
-        "SetLEConnectionParameters");
+        bluetooth_plugin_device::kSetLEConnectionParameters);
 
     dbus::MessageWriter writer(&method_call);
     dbus::MessageWriter dict_writer(nullptr);
     writer.OpenArray("{sq}", &dict_writer);
 
     {
       dbus::MessageWriter dict_entry_writer(nullptr);
       dict_writer.OpenDictEntry(&dict_entry_writer);
-      dict_entry_writer.AppendString("MinimumConnectionInterval");
+      dict_entry_writer.AppendString(
+          bluetooth_plugin_device::
+              kLEConnectionParameterMinimumConnectionInterval);
       dict_entry_writer.AppendUint16(conn_params.min_connection_interval);
       dict_writer.CloseContainer(&dict_entry_writer);
     }
 
     {
       dbus::MessageWriter dict_entry_writer(nullptr);
       dict_writer.OpenDictEntry(&dict_entry_writer);
-      dict_entry_writer.AppendString("MaximumConnectionInterval");
+      dict_entry_writer.AppendString(
+          bluetooth_plugin_device::
+              kLEConnectionParameterMaximumConnectionInterval);
       dict_entry_writer.AppendUint16(conn_params.max_connection_interval);
       dict_writer.CloseContainer(&dict_entry_writer);
     }
 
     writer.CloseContainer(&dict_writer);
 
     object_proxy->CallMethodWithErrorCallback(
         &method_call, dbus::ObjectProxy::TIMEOUT_USE_DEFAULT,
         base::Bind(&BluetoothDeviceClientImpl::OnSuccess,
                    weak_ptr_factory_.GetWeakPtr(), callback),
@@ skipping 134 matching lines @@
 
 BluetoothDeviceClient::BluetoothDeviceClient() {}
 
 BluetoothDeviceClient::~BluetoothDeviceClient() {}
 
 BluetoothDeviceClient* BluetoothDeviceClient::Create() {
   return new BluetoothDeviceClientImpl();
 }
 
 }  // namespace bluez