Remove empty cros_perf directory

Directory was inadvetently added in https://crrev.com/c/1986228

TEST=None
BUG=None

Change-Id: I0dc0f6d886946bf243debe8f14de70b30a1a6854
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/crostestutils/+/1988792
Tested-by: Greg Edelston <gredelston@google.com>
Reviewed-by: Rohit Makasana <rohitbm@chromium.org>
Commit-Queue: Greg Edelston <gredelston@google.com>
diff --git a/provingground/cros_perf/OWNERS b/provingground/cros_perf/OWNERS
deleted file mode 100644
index 3caa03e..0000000
--- a/provingground/cros_perf/OWNERS
+++ /dev/null
@@ -1 +0,0 @@
-rohitbm@chromium.org