Convert a few components from scoped_ptr to std::unique_ptr

components/storage_monitor/test_volume_mount_watcher_win.h

Index: components/storage_monitor/test_volume_mount_watcher_win.h
diff --git a/components/storage_monitor/test_volume_mount_watcher_win.h b/components/storage_monitor/test_volume_mount_watcher_win.h
index d6aa34679e48440b227c37cedfb45012ff9fd4be..89bbeecf330e4008f6a7d4b5c7642e3d28d1c9b3 100644
--- a/components/storage_monitor/test_volume_mount_watcher_win.h
+++ b/components/storage_monitor/test_volume_mount_watcher_win.h
@@ -10,6 +10,7 @@
 
 #include <stdint.h>
 
+#include <memory>
 #include <string>
 #include <vector>
 
@@ -56,7 +57,7 @@ class TestVolumeMountWatcherWin : public VolumeMountWatcherWin {
 
  private:
   std::vector<base::FilePath> devices_checked_;
-  scoped_ptr<base::WaitableEvent> device_check_complete_event_;
+  std::unique_ptr<base::WaitableEvent> device_check_complete_event_;
   bool attached_devices_fake_;
 
   DISALLOW_COPY_AND_ASSIGN(TestVolumeMountWatcherWin);