Fix iOS GN build and cleanup system_wrappers

webrtc/sdk/BUILD.gn

 # Copyright 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("../build/webrtc.gni")
 import("//build_overrides/webrtc.gni")
 
 if (is_ios) {
+  config("rtc_sdk_common_objc_config") {
+    include_dirs = [
+      "objc/Framework/Classes",
+      "objc/Framework/Headers",
+    ]
+  }
+
   source_set("rtc_sdk_common_objc") {
     deps = [
       "../base:rtc_base",
     ]
     cflags = [ "-fobjc-arc" ]
     configs += [ "..:common_config" ]
-    public_configs = [ "..:common_inherited_config" ]
-    include_dirs = [
-      "objc/Framework/Classes",
-      "objc/Framework/Headers",
+    public_configs = [
+      "..:common_inherited_config",
+      ":rtc_sdk_common_objc_config",
     ]
     sources = [
       "objc/Framework/Classes/NSString+StdString.h",
       "objc/Framework/Classes/NSString+StdString.mm",
       "objc/Framework/Classes/RTCCameraPreviewView.m",
       "objc/Framework/Classes/RTCDispatcher.m",
       "objc/Framework/Classes/RTCFieldTrials.mm",
       "objc/Framework/Classes/RTCLogging.mm",
       "objc/Framework/Classes/RTCSSLAdapter.mm",
       "objc/Framework/Classes/RTCTracing.mm",
@@ skipping 14 matching lines @@
       ]
     }
     libs = [ "AVFoundation.framework" ]
   }
 
   source_set("rtc_sdk_peerconnection_objc") {
     deps = [
       ":rtc_sdk_common_objc",
       #"../../talk/libjingle:libjingle_peerconnection",
     ]
-    cflags = [
-      "-fobjc-arc",
-      "-Wobjc-missing-property-synthesis",
-    ]
-    include_dirs = [
-      "objc/Framework/Classes",
-      "objc/Framework/Headers",
-    ]
+    configs += [ "//build/config/compiler:enable_arc" ]
+    cflags = [ "-Wobjc-missing-property-synthesis" ]
     sources = [
       # Add these when there's a BUILD.gn for peer connection APIs

[tkchin_webrtc, 2016/05/25 17:46:21]

Is there a plan to get GN working for peerconnection files? 
Otherwise this target is deceptive because it builds, but doesn't actually build
what you want.

[kjellander_webrtc, 2016/05/25 17:54:02]

That would be my next thing to look at. Getting these bots green has been the
main priority until now.

       #"objc/Framework/Classes/RTCAVFoundationVideoSource+Private.h",
       #"objc/Framework/Classes/RTCAVFoundationVideoSource.mm",
       #"objc/Framework/Classes/RTCAudioTrack+Private.h",
       #"objc/Framework/Classes/RTCAudioTrack.mm",
       #"objc/Framework/Classes/RTCConfiguration+Private.h",
       #"objc/Framework/Classes/RTCConfiguration.mm",
       #"objc/Framework/Classes/RTCDataChannel+Private.h",
       #"objc/Framework/Classes/RTCDataChannel.mm",
       #"objc/Framework/Classes/RTCDataChannelConfiguration+Private.h",
       #"objc/Framework/Classes/RTCDataChannelConfiguration.mm",
@@ skipping 69 matching lines @@
     }
 
     if (is_mac) {
       sources += [
         "objc/Framework/Classes/RTCNSGLVideoView.m",
         "objc/Framework/Headers/WebRTC/RTCNSGLVideoView.h",
       ]
     }
   }
 }