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

components/exo/gamepad.cc

Index: components/exo/gamepad.cc
diff --git a/components/exo/gamepad.cc b/components/exo/gamepad.cc
index dc49bcec9f55e7b07b740b0e901e888332ed900c..94102318880a59948d7cc47aea3151a07b3c3c27 100644
--- a/components/exo/gamepad.cc
+++ b/components/exo/gamepad.cc
@@ -54,7 +54,7 @@ class Gamepad::ThreadSafeGamepadChangeFetcher
   ThreadSafeGamepadChangeFetcher(
       const ProcessGamepadChangesCallback& post_gamepad_changes,
       const CreateGamepadDataFetcherCallback& create_fetcher_callback,
-      base::SingleThreadTaskRunner* task_runner)
+      scoped_refptr<base::SingleThreadTaskRunner> task_runner)
       : process_gamepad_changes_(post_gamepad_changes),
         create_fetcher_callback_(create_fetcher_callback),
         polling_task_runner_(task_runner),
@@ -141,7 +141,7 @@ class Gamepad::ThreadSafeGamepadChangeFetcher
   CreateGamepadDataFetcherCallback create_fetcher_callback_;
 
   // Reference to task runner on polling thread.
-  base::SingleThreadTaskRunner* polling_task_runner_;
+  scoped_refptr<base::SingleThreadTaskRunner> polling_task_runner_;
 
   // Reference to task runner on origin thread.
   scoped_refptr<base::SingleThreadTaskRunner> origin_task_runner_;
@@ -167,15 +167,17 @@ class Gamepad::ThreadSafeGamepadChangeFetcher
 ////////////////////////////////////////////////////////////////////////////////
 // Gamepad, public:
 
-Gamepad::Gamepad(GamepadDelegate* delegate,
-                 base::SingleThreadTaskRunner* polling_task_runner)
+Gamepad::Gamepad(
+    GamepadDelegate* delegate,
+    scoped_refptr<base::SingleThreadTaskRunner> polling_task_runner)
     : Gamepad(delegate,
               polling_task_runner,
               base::Bind(CreateGamepadPlatformDataFetcher)) {}
 
-Gamepad::Gamepad(GamepadDelegate* delegate,
-                 base::SingleThreadTaskRunner* polling_task_runner,
-                 CreateGamepadDataFetcherCallback create_fetcher_callback)
+Gamepad::Gamepad(
+    GamepadDelegate* delegate,
+    scoped_refptr<base::SingleThreadTaskRunner> polling_task_runner,
+    CreateGamepadDataFetcherCallback create_fetcher_callback)
     : delegate_(delegate), weak_factory_(this) {
   gamepad_change_fetcher_ = new ThreadSafeGamepadChangeFetcher(
       base::Bind(&Gamepad::ProcessGamepadChanges, weak_factory_.GetWeakPtr()),