exo: Fix crash in out-of-order destruction of Gamepad

components/exo/gamepad.h

Index: components/exo/gamepad.h
diff --git a/components/exo/gamepad.h b/components/exo/gamepad.h
index 578a8d12fd9be800bf322c6838992f3dd26b751b..020a23d9494cdf79cdde7de7252540d4a129244b 100644
--- a/components/exo/gamepad.h
+++ b/components/exo/gamepad.h
@@ -30,11 +30,11 @@ class Gamepad : public aura::client::FocusChangeObserver {
   // This class will post tasks to invoke the delegate on the thread runner
   // which is associated with the thread that is creating this instance.
   Gamepad(GamepadDelegate* delegate,
-          base::SingleThreadTaskRunner* polling_task_runner);
+          scoped_refptr<base::SingleThreadTaskRunner> polling_task_runner);

[reveman, 2016/07/19 17:16:53]

This just adds ref-count churn. Passing a raw pointer as before is fine.

   // Allows test cases to specify a CreateGamepadDataFetcherCallback that
   // overrides the default GamepadPlatformDataFetcher.
   Gamepad(GamepadDelegate* delegate,
-          base::SingleThreadTaskRunner* polling_task_runner,
+          scoped_refptr<base::SingleThreadTaskRunner> polling_task_runner,

[reveman, 2016/07/19 17:16:53]

ditto

           CreateGamepadDataFetcherCallback create_fetcher_callback);
   ~Gamepad() override;