Move optional.h to webrtc/api/

webrtc/test/BUILD.gn

 # Copyright (c) 2014 The WebRTC project authors. All Rights Reserved.
 #
 # Use of this source code is governed by a BSD-style license
 # that can be found in the LICENSE file in the root of the source
 # tree. An additional intellectual property rights grant can be found
 # in the file PATENTS.  All contributing project authors may
 # be found in the AUTHORS file in the root of the source tree.
 
 import("../webrtc.gni")
 import("//build/config/ui.gni")
@@ skipping 42 matching lines @@
     "video_codec_settings.h",
   ]
 
   if (!build_with_chromium && is_clang) {
     # Suppress warnings from the Chromium Clang plugin (bugs.webrtc.org/163).
     suppressed_configs += [ "//build/config/clang:find_bad_constructs" ]
   }
 
   deps = [
     "..:webrtc_common",
+    "../api:optional",
     "../api/video_codecs:video_codecs_api",
     "../call:video_stream_api",
     "../common_video",
     "../media:rtc_media_base",
     "../modules/video_capture:video_capture_module",
     "../rtc_base:rtc_base_approved",
     "../rtc_base:rtc_task_queue",
     "../system_wrappers",
   ]
 }
@@ skipping 290 matching lines @@
 
 rtc_source_set("fileutils") {
   testonly = true
   visibility = [ ":*" ]
   sources = [
     "testsupport/fileutils.cc",
     "testsupport/fileutils.h",
   ]
   deps = [
     "..:webrtc_common",
+    "../api:optional",
     "../rtc_base:rtc_base_approved",
   ]
   if (is_ios) {
     deps += [ ":fileutils_objc" ]
   }
   if (is_win) {
     deps += [ "../rtc_base:rtc_base" ]
   }
 }
 
@@ skipping 44 matching lines @@
 
 rtc_source_set("fileutils_unittests") {
   testonly = true
   visibility = [ ":*" ]  # Only targets in this file can depend on this.
   sources = [
     "testsupport/fileutils_unittest.cc",
   ]
   deps = [
     ":fileutils",
     ":test_support",
+    "../api:optional",
     "../rtc_base:rtc_base_approved",
     "//testing/gmock",
     "//testing/gtest",
   ]
 }
 
 rtc_source_set("direct_transport") {
   testonly = true
   sources = [
     "direct_transport.cc",
@@ skipping 267 matching lines @@
     ]
     deps = [
       "../rtc_base:base_java",
       "//testing/android/native_test:native_test_java",
     ]
 
     # TODO(sakal): Fix build hooks crbug.com/webrtc/8148
     no_build_hooks = true
   }
 }