[Device Service] Move Gamepad Blink headers to be part of the Gamepad client library

device/gamepad/gamepad_consumer.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_GAMEPAD_GAMEPAD_CONSUMER_H_
 #define DEVICE_GAMEPAD_GAMEPAD_CONSUMER_H_
 
 #include "device/gamepad/gamepad_export.h"
-#include "third_party/WebKit/public/platform/WebGamepad.h"
+#include "device/gamepad/public/cpp/gamepad.h"
 
 namespace device {
 
 class DEVICE_GAMEPAD_EXPORT GamepadConsumer {
  public:
   GamepadConsumer();
   virtual ~GamepadConsumer();
 
-  virtual void OnGamepadConnected(unsigned index,
-                                  const blink::WebGamepad& gamepad) = 0;
+  virtual void OnGamepadConnected(unsigned index, const Gamepad& gamepad) = 0;
   virtual void OnGamepadDisconnected(unsigned index,
-                                     const blink::WebGamepad& gamepad) = 0;
+                                     const Gamepad& gamepad) = 0;
 };
 
 }  // namespace device
 
 #endif  // DEVICE_GAMEPAD_GAMEPAD_CONSUMER_H_