IWYU fix in tab_desktop_media_list_unittest.cc.

BUG=546640
R=guidou@chromium.org


Change-Id: I7d5b4aefd1ea485d44f331d05e5e3f7b8207513a
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1899487
Auto-Submit: Greg Thompson <grt@chromium.org>
Commit-Queue: Tommi <tommi@chromium.org>
Reviewed-by: Tommi <tommi@chromium.org>
Cr-Commit-Position: refs/heads/master@{#712510}

chrome/browser/media/webrtc/tab_desktop_media_list_unittest.cc

@@ -6,6 +6,7 @@
 
 #include "base/command_line.h"
 #include "base/files/file_util.h"
+#include "base/files/scoped_temp_dir.h"
 #include "base/location.h"
 #include "base/run_loop.h"
 #include "base/single_thread_task_runner.h"