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

components/exo/gamepad_unittest.cc

 // Copyright 2015 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "ash/shell.h"
 #include "base/command_line.h"
 #include "base/test/test_simple_task_runner.h"
 #include "components/exo/buffer.h"
 #include "components/exo/gamepad.h"
 #include "components/exo/gamepad_delegate.h"
@@ skipping 29 matching lines @@
   std::unique_ptr<device::GamepadDataFetcher> MockDataFetcherFactory() {
     blink::WebGamepads initial_data;
     std::unique_ptr<device::MockGamepadDataFetcher> fetcher(
         new device::MockGamepadDataFetcher(initial_data));
     mock_data_fetcher_ = fetcher.get();
     return std::move(fetcher);
   }
 
   void InitializeGamepad(MockGamepadDelegate* delegate) {
     polling_task_runner_ = new base::TestSimpleTaskRunner();
-    gamepad_.reset(new Gamepad(delegate, polling_task_runner_.get(),
+    gamepad_.reset(new Gamepad(delegate, polling_task_runner_,
                                base::Bind(&GamepadTest::MockDataFetcherFactory,
                                           base::Unretained(this))));
     // Run the polling task runner to have it create the data fetcher.
     polling_task_runner_->RunPendingTasks();
   }
 
   void DestroyGamepad(MockGamepadDelegate* delegate) {
     EXPECT_CALL(*delegate, OnGamepadDestroying(testing::_)).Times(1);
     mock_data_fetcher_ = nullptr;
     gamepad_.reset();
@@ skipping 151 matching lines @@
   // scheduled in the next round.
   polling_task_runner_->RunPendingTasks();
   polling_task_runner_->RunPendingTasks();
   ASSERT_FALSE(polling_task_runner_->HasPendingTask());
 
   DestroyGamepad(&delegate);
 }
 
 }  // namespace
 }  // namespace exo