Move gamepad_service out of content/ and into device/

device/gamepad/gamepad_provider.h

Index: device/gamepad/gamepad_provider.h
diff --git a/device/gamepad/gamepad_provider.h b/device/gamepad/gamepad_provider.h
index 6b24340ad0baa47e7f4b4fb9a0f90507f6a5b539..5cf4fdad26d1410cf7df19de1e9ff5bf0a1d8bc7 100644
--- a/device/gamepad/gamepad_provider.h
+++ b/device/gamepad/gamepad_provider.h
@@ -42,12 +42,10 @@ class DEVICE_GAMEPAD_EXPORT GamepadProvider
       public base::SystemMonitor::DevicesChangedObserver {
  public:
   explicit GamepadProvider(
-      std::unique_ptr<GamepadSharedBuffer> buffer,
       GamepadConnectionChangeClient* connection_change_client);
 
   // Manually specifies the data fetcher. Used for testing.
   explicit GamepadProvider(
-      std::unique_ptr<GamepadSharedBuffer> buffer,
       GamepadConnectionChangeClient* connection_change_client,
       std::unique_ptr<GamepadDataFetcher> fetcher);