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

device/gamepad/gamepad_monitor.cc

Index: device/gamepad/gamepad_monitor.cc
diff --git a/device/gamepad/gamepad_monitor.cc b/device/gamepad/gamepad_monitor.cc
index 93990d3711a8add03f127da3b53eb3ed60ff85ae..c385d18f5e02074c1746e152f98609fa1021c9e3 100644
--- a/device/gamepad/gamepad_monitor.cc
+++ b/device/gamepad/gamepad_monitor.cc
@@ -26,13 +26,13 @@ void GamepadMonitor::Create(mojom::GamepadMonitorRequest request) {
 }
 
 void GamepadMonitor::OnGamepadConnected(unsigned index,
-                                        const blink::WebGamepad& gamepad) {
+                                        const Gamepad& gamepad) {
   if (gamepad_observer_)
     gamepad_observer_->GamepadConnected(index, gamepad);
 }
 
 void GamepadMonitor::OnGamepadDisconnected(unsigned index,
-                                           const blink::WebGamepad& gamepad) {
+                                           const Gamepad& gamepad) {
   if (gamepad_observer_)
     gamepad_observer_->GamepadDisconnected(index, gamepad);
 }