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

third_party/WebKit/Source/modules/gamepad/GamepadList.cpp

 /*
  * Copyright (C) 2011, Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are met:
  *
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
  *    notice, this list of conditions and the following disclaimer in the
@@ skipping 12 matching lines @@
  * DAMAGE.
  */
 
 #include "modules/gamepad/GamepadList.h"
 
 namespace blink {
 
 GamepadList::GamepadList() {}
 
 void GamepadList::Set(unsigned index, Gamepad* gamepad) {
-  if (index >= WebGamepads::kItemsLengthCap)
+  if (index >= device::Gamepads::kItemsLengthCap)
     return;
   items_[index] = gamepad;
 }
 
 Gamepad* GamepadList::item(unsigned index) {
   return index < length() ? items_[index].Get() : 0;
 }
 
 DEFINE_TRACE(GamepadList) {
-  for (unsigned index = 0; index < WebGamepads::kItemsLengthCap; index++) {
+  for (unsigned index = 0; index < device::Gamepads::kItemsLengthCap; index++) {
     visitor->Trace(items_[index]);
   }
 }
 
 }  // namespace blink