Reland of GN: Enable ARC for Mac and iOS in rtc_* templates

webrtc/examples/BUILD.gn

 # Copyright (c) 2016 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")
 if (is_android) {
@@ skipping 142 matching lines @@
   config("apprtc_common_config") {
     include_dirs = [ "objc/AppRTCMobile/common" ]
   }
 
   rtc_static_library("apprtc_common") {
     testonly = true
     sources = [
       "objc/AppRTCMobile/common/ARDUtilities.h",
       "objc/AppRTCMobile/common/ARDUtilities.m",
     ]
-    configs += [ "//build/config/compiler:enable_arc" ]
     public_configs = [ ":apprtc_common_config" ]
 
     deps = [
       "//webrtc/sdk:rtc_sdk_common_objc",
       "//webrtc/system_wrappers:field_trial_default",
       "//webrtc/system_wrappers:metrics_default",
     ]
   }
 
   config("apprtc_signaling_config") {
@@ skipping 46 matching lines @@
       "objc/AppRTCMobile/ARDWebSocketChannel.m",
       "objc/AppRTCMobile/RTCIceCandidate+JSON.h",
       "objc/AppRTCMobile/RTCIceCandidate+JSON.m",
       "objc/AppRTCMobile/RTCIceServer+JSON.h",
       "objc/AppRTCMobile/RTCIceServer+JSON.m",
       "objc/AppRTCMobile/RTCMediaConstraints+JSON.h",
       "objc/AppRTCMobile/RTCMediaConstraints+JSON.m",
       "objc/AppRTCMobile/RTCSessionDescription+JSON.h",
       "objc/AppRTCMobile/RTCSessionDescription+JSON.m",
     ]
-    configs += [ "//build/config/compiler:enable_arc" ]
     public_configs = [ ":apprtc_signaling_config" ]
     deps = [
       ":apprtc_common",
       ":socketrocket",
     ]
     public_deps = [
       "//webrtc/sdk:rtc_sdk_peerconnection_objc",
     ]
     libs = [ "QuartzCore.framework" ]
   }
@@ skipping 12 matching lines @@
         "objc/AppRTCMobile/ios/ARDStatsView.h",
         "objc/AppRTCMobile/ios/ARDStatsView.m",
         "objc/AppRTCMobile/ios/ARDVideoCallView.h",
         "objc/AppRTCMobile/ios/ARDVideoCallView.m",
         "objc/AppRTCMobile/ios/ARDVideoCallViewController.h",
         "objc/AppRTCMobile/ios/ARDVideoCallViewController.m",
         "objc/AppRTCMobile/ios/AppRTCMobile-Prefix.pch",
         "objc/AppRTCMobile/ios/UIImage+ARDUtilities.h",
         "objc/AppRTCMobile/ios/UIImage+ARDUtilities.m",
       ]
-      configs += [ "//build/config/compiler:enable_arc" ]
 
       deps = [
         ":apprtc_common",
         ":apprtc_signaling",
         "//webrtc/modules/audio_device",
       ]
     }
 
     ios_app_bundle("AppRTCMobile") {
       testonly = true
@@ skipping 56 matching lines @@
 
   if (is_mac) {
     rtc_static_library("AppRTCMobile_lib") {
       testonly = true
       sources = [
         "objc/AppRTCMobile/mac/APPRTCAppDelegate.h",
         "objc/AppRTCMobile/mac/APPRTCAppDelegate.m",
         "objc/AppRTCMobile/mac/APPRTCViewController.h",
         "objc/AppRTCMobile/mac/APPRTCViewController.m",
       ]
-      configs += [
-        "//webrtc:common_objc",
-        "//build/config/compiler:enable_arc",
-      ]
+      configs += [ "//webrtc:common_objc" ]
       deps = [
         ":apprtc_common",
         ":apprtc_signaling",
       ]
     }
 
     mac_app_bundle("AppRTCMobile") {
       testonly = true
       output_name = "AppRTCMobile"
 
@@ skipping 33 matching lines @@
       "-Wno-objc-missing-property-synthesis",
     ]
   }
 
   rtc_static_library("socketrocket") {
     testonly = true
     sources = [
       "objc/AppRTCMobile/third_party/SocketRocket/SRWebSocket.h",
       "objc/AppRTCMobile/third_party/SocketRocket/SRWebSocket.m",
     ]
-    configs += [
-      "//build/config/compiler:enable_arc",
-      ":socketrocket_warning_config",
-    ]
+    configs += [ ":socketrocket_warning_config" ]
     public_configs = [ ":socketrocket_include_config" ]
 
     libs = [
       "CFNetwork.framework",
       "icucore",
     ]
   }
 
   if (rtc_include_tests) {
     # TODO(kthelgason): compile xctests on mac when chromium supports it.
@@ skipping 12 matching lines @@
         ]
         deps = [
           "//webrtc/base:rtc_base",
         ]
         public_deps = [
           ":AppRTCMobile_ios_frameworks",
           ":AppRTCMobile_lib",
           "//build/config/ios:xctest",
           "//third_party/ocmock",
         ]
-        configs += [ "//build/config/compiler:enable_arc" ]
       }
 
       rtc_ios_xctest_test("apprtcmobile_tests") {
         info_plist = "objc/AppRTCMobile/ios/Info.plist"
         sources = [
           "objc/AppRTCMobile/ios/main.m",
         ]
         deps = [
           ":apprtcmobile_test_sources",
         ]
@@ skipping 187 matching lines @@
 
     deps = [
       "../base:rtc_base",
       "../base:rtc_base_approved",
       "../p2p:libstunprober",
       "../p2p:rtc_p2p",
       "../system_wrappers:field_trial_default",
     ]
   }
 }