Fix Mac ObjC PeerConnection API compilation.

talk/libjingle.gyp

 #
 # libjingle
 # Copyright 2012 Google Inc.
 #
 # Redistribution and use in source and binary forms, with or without
 # modification, are permitted provided that the following conditions are met:
 #
 #  1. Redistributions of source code must retain the above copyright notice,
 #     this list of conditions and the following disclaimer.
 #  2. Redistributions in binary form must reproduce the above copyright notice,
@@ skipping 230 matching lines @@
               'app/webrtc/java/android',
               '<(webrtc_base_dir)/java/src',
               '<(webrtc_modules_dir)/audio_device/android/java/src',
               '<(webrtc_modules_dir)/video_render/android/java/src',
             ],
           },
           'includes': ['../build/java.gypi'],
         }, # libjingle_peerconnection_java
       ]
     }],
-    ['OS=="ios" or (OS=="mac" and target_arch!="ia32" and mac_sdk>="10.7")', {
+    ['OS=="ios" or (OS=="mac" and target_arch!="ia32")', {
       # The >= 10.7 above is required for ARC.
       'targets': [
         {
           'target_name': 'libjingle_peerconnection_objc',
           'type': 'static_library',
           'dependencies': [
             'libjingle_peerconnection',
           ],
           'sources': [
             'app/webrtc/objc/RTCAudioTrack+Internal.h',
@@ skipping 531 matching lines @@
         ['OS=="android" and build_with_chromium==0', {
           'sources': [
             'app/webrtc/androidvideocapturer.h',
             'app/webrtc/androidvideocapturer.cc',
            ],
         }],
       ],
     },  # target libjingle_peerconnection
   ],
 }