Compile rtc_base_objc and rtc_api_objc for Mac

webrtc/api/api_tests.gyp

Index: webrtc/api/api_tests.gyp
diff --git a/webrtc/api/api_tests.gyp b/webrtc/api/api_tests.gyp
index cdb23fb290c16bb9193f29dd243b1a591f59bcfe..7d0b114f05f499b3f37b28b5743ac577711d6f78 100644
--- a/webrtc/api/api_tests.gyp
+++ b/webrtc/api/api_tests.gyp
@@ -9,11 +9,12 @@
 {
   'includes': [ '../build/common.gypi', ],
   'conditions': [
-    ['OS=="ios"', {
+    ['OS=="ios" or OS=="mac"', {
       'targets': [
         {
           'target_name': 'rtc_api_objc_tests',
           'type': 'executable',
+          'includes': [ '../build/objc_common.gypi' ],
           'dependencies': [
             '<(webrtc_root)/api/api.gyp:rtc_api_objc',
             '<(webrtc_root)/base/base_tests.gyp:rtc_base_tests_utils',
@@ -27,9 +28,6 @@
             'objctests/RTCSessionDescriptionTest.mm',
           ],
           'xcode_settings': {
-            'CLANG_ENABLE_OBJC_ARC': 'YES',
-            'CLANG_WARN_OBJC_MISSING_PROPERTY_SYNTHESIS': 'YES',
-            'GCC_PREFIX_HEADER': 'objc/WebRTC-Prefix.pch',
             # |-ObjC| flag needed to make sure category method implementations
             # are included:
             # https://developer.apple.com/library/mac/qa/qa1490/_index.html