Remove the public_deps to fileutils from test_support.

Bug: webrtc:8946
Change-Id: Ia01d8bb1b42485e29f26792b9266228743d7fd90
No-Presubmit: true
Reviewed-on: https://webrtc-review.googlesource.com/62100
Commit-Queue: Artem Titov <titovartem@webrtc.org>
Reviewed-by: Artem Titov <titovartem@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#22465}
diff --git a/audio/BUILD.gn b/audio/BUILD.gn
index 39a1db3..b086971 100644
--- a/audio/BUILD.gn
+++ b/audio/BUILD.gn
@@ -179,6 +179,7 @@
         "../common_audio",
         "../rtc_base:rtc_base_approved",
         "../system_wrappers",
+        "../test:fileutils",
         "../test:test_common",
         "../test:test_main",
         "//testing/gtest",
@@ -230,6 +231,7 @@
       "../rtc_base:rtc_base_approved",
       "../system_wrappers",
       "../test:field_trial",
+      "../test:fileutils",
       "../test:single_threaded_task_queue",
       "../test:test_common",
       "../test:test_main",