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

device/gamepad/gamepad_shared_buffer.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 "device/gamepad/gamepad_shared_buffer.h"
 
 namespace device {
 
 GamepadSharedBuffer::GamepadSharedBuffer() {
   size_t data_size = sizeof(GamepadHardwareBuffer);
   bool res = shared_memory_.CreateAndMapAnonymous(data_size);
   CHECK(res);
 
   void* mem = shared_memory_.memory();
   DCHECK(mem);
   hardware_buffer_ = new (mem) GamepadHardwareBuffer();
-  memset(&(hardware_buffer_->data), 0, sizeof(blink::WebGamepads));
+  memset(&(hardware_buffer_->data), 0, sizeof(Gamepads));
 }
 
 GamepadSharedBuffer::~GamepadSharedBuffer() {}
 
 base::SharedMemory* GamepadSharedBuffer::shared_memory() {
   return &shared_memory_;
 }
 
-blink::WebGamepads* GamepadSharedBuffer::buffer() {
+Gamepads* GamepadSharedBuffer::buffer() {
   return &(hardware_buffer()->data);
 }
 
 GamepadHardwareBuffer* GamepadSharedBuffer::hardware_buffer() {
   return hardware_buffer_;
 }
 
 void GamepadSharedBuffer::WriteBegin() {
   hardware_buffer_->seqlock.WriteBegin();
 }
 
 void GamepadSharedBuffer::WriteEnd() {
   hardware_buffer_->seqlock.WriteEnd();
 }
 
 }  // namespace device