Eliminate defines in talk/

talk/build/common.gypi

 #
 # 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 42 matching lines @@
   },
   'target_defaults': {
     'include_dirs': [
       '<(DEPTH)',
       '../..',
       '../../third_party',
       '../../third_party/webrtc',
       '../../webrtc',
     ],
     'defines': [
-      'EXPAT_RELATIVE_PATH',
-      'FEATURE_ENABLE_VOICEMAIL',
-      'GTEST_RELATIVE_PATH',
-      'JSONCPP_RELATIVE_PATH',
-      'LOGGING=1',
       'SRTP_RELATIVE_PATH',
 
       # Feature selection
-      'FEATURE_ENABLE_SSL',
-      'FEATURE_ENABLE_VOICEMAIL',
-      'FEATURE_ENABLE_PSTN',
       'HAVE_SCTP',
       'HAVE_SRTP',
       'HAVE_WEBRTC_VIDEO',
       'HAVE_WEBRTC_VOICE',
     ],
     'conditions': [
       ['OS=="linux"', {
         'defines': [
-          'LINUX',
           'WEBRTC_LINUX',
         ],
         # Remove Chromium's disabling of the -Wformat warning.
         'cflags!': [
           '-Wno-format',
         ],
         'conditions': [
           ['clang==1', {
             'cflags': [
               '-Wall',
@@ skipping 11 matching lines @@
               '-Wthread-safety',
             ],
             'cflags_cc': [
               '-Wunused-private-field',
             ],
           }],
         ],
       }],
       ['OS=="mac"', {
         'defines': [
-          'OSX',
           'WEBRTC_MAC',
         ],
       }],
       ['OS=="win"', {
         'defines': [
           'WEBRTC_WIN',
         ],
         'msvs_disabled_warnings': [
           # https://code.google.com/p/chromium/issues/detail?id=372451#c20
           # Warning 4702 ("Unreachable code") should be re-enabled once
           # users are updated to VS2013 Update 2.
             4702,
         ],
       }],
       ['OS=="ios"', {
         'defines': [
-          'IOS',
           'WEBRTC_MAC',
           'WEBRTC_IOS',
         ],
       }],
       ['OS=="ios" or (OS=="mac" and target_arch!="ia32")', {
         'defines': [
           'CARBON_DEPRECATED=YES',
         ],
       }],
       ['os_posix==1', {
@@ skipping 11 matching lines @@
           'HASH_NAMESPACE=__gnu_cxx',
           'WEBRTC_POSIX',
           'DISABLE_DYNAMIC_CAST',
           # The POSIX standard says we have to define this.
           '_REENTRANT',
         ],
       }],
     ],
   }, # target_defaults
 }