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

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

Index: third_party/WebKit/Source/modules/gamepad/GamepadList.h
diff --git a/third_party/WebKit/Source/modules/gamepad/GamepadList.h b/third_party/WebKit/Source/modules/gamepad/GamepadList.h
index df484683d0b9b85fb117ad7a0465ec0469aa7ebe..31e4f7e2302fff1aa2d0a2b98f6096b08843f67c 100644
--- a/third_party/WebKit/Source/modules/gamepad/GamepadList.h
+++ b/third_party/WebKit/Source/modules/gamepad/GamepadList.h
@@ -27,9 +27,9 @@
 #define GamepadList_h
 
 #include "bindings/core/v8/ScriptWrappable.h"
+#include "device/gamepad/public/cpp/gamepads.h"
 #include "modules/gamepad/Gamepad.h"
 #include "platform/heap/Handle.h"
-#include "public/platform/WebGamepads.h"
 
 namespace blink {
 
@@ -42,13 +42,13 @@ class GamepadList final : public GarbageCollected<GamepadList>,
 
   void Set(unsigned index, Gamepad*);
   Gamepad* item(unsigned index);
-  unsigned length() const { return WebGamepads::kItemsLengthCap; }
+  unsigned length() const { return device::Gamepads::kItemsLengthCap; }
 
   DECLARE_TRACE();
 
  private:
   GamepadList();
-  Member<Gamepad> items_[WebGamepads::kItemsLengthCap];
+  Member<Gamepad> items_[device::Gamepads::kItemsLengthCap];
 };
 
 }  // namespace blink