Add wtf_unittests target that links unit tests outside DLL

Source/WebKit/chromium/WebKitUnitTests.gyp

 #
 # Copyright (C) 2011 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 61 matching lines @@
                         'WEBKIT_DLL_UNITTEST',
                     ],
                 }, {
                     'dependencies': [
                         '../../core/core.gyp/core.gyp:webcore',
                     ],
                     'defines': [
                         'WEBKIT_IMPLEMENTATION=1',
                     ],
                     'sources': [
-                        '<@(wtf_unittest_files)',
                         '<@(core_unittest_files)',
                         '<@(webkit_unittest_files)',
                     ],
                     'conditions': [
                         ['toolkit_uses_gtk == 1', {
                             'include_dirs': [
                                 'public/gtk',
                             ],
                             'variables': {
                             # FIXME: Enable warnings on other platforms.
@@ skipping 61 matching lines @@
         ['clang==1', {
             'target_defaults': {
                 'cflags': ['-Wunused-parameter'],
                 'xcode_settings': {
                     'WARNING_CFLAGS': ['-Wunused-parameter'],
                 },
             },
         }],
     ],
 }