[iOS] Clean deps and public_deps.

ios/chrome/browser/ui/voice/BUILD.gn

 # Copyright 2015 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 source_set("voice") {
   configs += [ "//build/config/compiler:enable_arc" ]
   sources = [
     "text_to_speech_player+subclassing.h",
     "text_to_speech_player.h",
     "text_to_speech_player.mm",
     "voice_search_notification_names.h",
     "voice_search_notification_names.mm",
   ]
 
   deps = [
     "//base",
   ]
 
   libs = [ "AVFoundation.framework" ]
 }
 
 source_set("unit_tests") {
   testonly = true
 
   sources = [
     "text_to_speech_player_unittest.mm",
   ]
 
   deps = [
+    ":voice",
     ":voice_unit_tests_bundle_data",
     "//base",
     "//base/test:test_support",
     "//ios/web",
     "//ios/web:test_support",
     "//testing/gtest",
     "//url",
   ]
-
-  public_deps = [
-    ":voice",
-  ]
 }
 
 bundle_data("voice_unit_tests_bundle_data") {
   visibility = [ ":unit_tests" ]
   testonly = true
   sources = [
     "//ios/chrome/test/data/voice/test_sound.m4a",
   ]
   outputs = [
     "{{bundle_resources_dir}}/{{source_root_relative_dir}}/" +
         "{{source_file_part}}",
   ]
 }