Remove BrowserThread dependency from usb_service.

device/common/device_client.h

+// Copyright 2014 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 DEVICE_COMMON_DEVICE_CLIENT_H_
+#define DEVICE_COMMON_DEVICE_CLIENT_H_
+
+namespace usb_service {
+class UsbService;
+}
+
+namespace device {
+
+class DeviceClient {

[scheib, 2014/08/28 18:18:14]

Every class definition should have an accompanying comment that describes what
it is for and how it should be used.
http://google-styleguide.googlecode.com/svn/trunk/cppguide.xml#Class_Comments
dito elsewhere.

+ public:
+  // Construction sets the singlse instance.
+  DeviceClient();
+
+  // Destruction clears the single instance.
+  ~DeviceClient();
+
+  // Returns the single instance of |this|.
+  static DeviceClient* Get();
+
+  // Returns the UsbService instance for this embedder.
+  virtual usb_service::UsbService* GetUsbService();
+};
+
+}  // namespace device
+
+#endif  // DEVICE_COMMON_DEVICE_CLIENT_H_