Fix race in MediaDevicesPermissionChecker.

content/browser/renderer_host/media/media_devices_dispatcher_host_unittest.cc

Index: content/browser/renderer_host/media/media_devices_dispatcher_host_unittest.cc
diff --git a/content/browser/renderer_host/media/media_devices_dispatcher_host_unittest.cc b/content/browser/renderer_host/media/media_devices_dispatcher_host_unittest.cc
index 658d47b892ed3af485a2d4d55134eebbc0bbdd03..f2cecbc183e94e56838cf6b92f8c477ccae05535 100644
--- a/content/browser/renderer_host/media/media_devices_dispatcher_host_unittest.cc
+++ b/content/browser/renderer_host/media/media_devices_dispatcher_host_unittest.cc
@@ -13,6 +13,7 @@
 
 #include "base/bind.h"
 #include "base/command_line.h"
+#include "base/memory/ptr_util.h"
 #include "base/run_loop.h"
 #include "base/threading/thread_task_runner_handle.h"
 #include "content/browser/renderer_host/media/media_stream_manager.h"
@@ -96,9 +97,8 @@ class MediaDevicesDispatcherHostTest : public testing::Test {
                                         bool enumerate_video_input,
                                         bool enumerate_audio_output,
                                         bool permission_override_value = true) {
-    MediaDevicesPermissionChecker permission_checker;
-    permission_checker.OverridePermissionsForTesting(permission_override_value);
-    host_->SetPermissionChecker(permission_checker);
+    host_->SetPermissionChecker(base::MakeUnique<MediaDevicesPermissionChecker>(
+        permission_override_value));
     base::RunLoop run_loop;
     host_->EnumerateDevices(
         enumerate_audio_input, enumerate_video_input, enumerate_audio_output,