Fixes three crashes

athena/system/system_ui_impl.cc

 // Copyright 2014 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 "athena/system/public/system_ui.h"
 
 #include "athena/system/device_socket_listener.h"
 #include "athena/system/orientation_controller.h"
 #include "athena/system/power_button_controller.h"
 #include "base/logging.h"
 #include "base/memory/ref_counted.h"
 #include "base/memory/scoped_ptr.h"
 
 namespace athena {
 namespace {
 
 SystemUI* instance = NULL;
 
 class SystemUIImpl : public SystemUI {
  public:
-  SystemUIImpl(scoped_refptr<base::TaskRunner> io_task_runner)
+  SystemUIImpl(scoped_refptr<base::TaskRunner> file_task_runner)
       : orientation_controller_(new OrientationController()),
         power_button_controller_(new PowerButtonController) {
-    orientation_controller_->InitWith(io_task_runner);
+    orientation_controller_->InitWith(file_task_runner);
   }
 
   virtual ~SystemUIImpl() {
+    // Stops file watching now if exists. Waiting until message loop shutdon
+    // leads to FilePathWatcher crash.
+    orientation_controller_->Shutdown();
   }
 
  private:
   scoped_refptr<OrientationController> orientation_controller_;
   scoped_ptr<PowerButtonController> power_button_controller_;
 
   DISALLOW_COPY_AND_ASSIGN(SystemUIImpl);
 };
 
 }  // namespace
 
 // static
-SystemUI* SystemUI::Create(
-    scoped_refptr<base::TaskRunner> io_task_runner) {
-  DeviceSocketListener::CreateSocketManager(io_task_runner);
-  instance = new SystemUIImpl(io_task_runner);
+SystemUI* SystemUI::Create(scoped_refptr<base::TaskRunner> file_task_runner) {
+  DeviceSocketListener::CreateSocketManager(file_task_runner);
+  instance = new SystemUIImpl(file_task_runner);
   return instance;
 }
 
 // static
 void SystemUI::Shutdown() {
   CHECK(instance);
   delete instance;
   instance = NULL;
   DeviceSocketListener::ShutdownSocketManager();
 }
 
 }  // namespace athena