Add wtf_unittests target that links unit tests outside DLL

Source/config.gyp

 #
 # Copyright (C) 2013 Google Inc. All rights reserved.
 #
 # Redistribution and use in source and binary forms, with or without
 # modification, are permitted provided that the following conditions are
 # met:
 #
 #     * Redistributions of source code must retain the above copyright
 # notice, this list of conditions and the following disclaimer.
 #     * Redistributions in binary form must reproduce the above
@@ skipping 19 matching lines @@
 {
   'variables': {
     # If set to 1, doesn't compile debug symbols into webcore reducing the
     # size of the binary and increasing the speed of gdb.  gcc only.
     'remove_webcore_debug_symbols%': 0,
   },
   'targets': [{
     'target_name': 'config',
     'type': 'none',
     'direct_dependent_settings': {
-      'defines': [
-        'WEBKIT_IMPLEMENTATION=1',
-      ],
       'msvs_disabled_warnings': [
         4138, 4244, 4291, 4305, 4344, 4355, 4521, 4099,
       ],
       'conditions': [
         ['OS=="win" and component=="shared_library"', {
           'defines': [
             'USING_V8_SHARED',
           ],
         }],
         ['OS=="win"', {
@@ skipping 18 matching lines @@
         ['clang==1', {
           'cflags': ['-Wglobal-constructors'],
           'xcode_settings': {
             'WARNING_CFLAGS': ['-Wglobal-constructors'],
           },
         }],
       ],
     },
   }],
 }