Removing SwiftShader tests on Mac

content/test/gpu/generate_buildbot_json.py

 #!/usr/bin/env python
 # Copyright 2016 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 """Script to generate chromium.gpu.json and chromium.gpu.fyi.json in
 the src/testing/buildbot directory. Maintaining these files by hand is
 too unwieldy.
 """
 
@@ skipping 1093 matching lines @@
       '--disable-gpu-sandbox',
     ],
     'test': 'gles2_conform_test',
   },
   'swiftshader_unittests': {
     'tester_configs': [
       {
         'fyi_only': True,
         # Run this on the optional tryservers.
         'run_on_optional': True,
+        'os_types': ['win', 'linux'],
       },
     ],
   },
   'tab_capture_end2end_tests': {
     'tester_configs': [
       {
         'build_configs': ['Release', 'Release_x64'],
       }
     ],
     'override_compile_targets': [
@@ skipping 595 matching lines @@
     json.dump(tests, fp, indent=2, separators=(',', ': '), sort_keys=True)
     fp.write('\n')
 
 def main():
   generate_all_tests(FYI_WATERFALL, True)
   generate_all_tests(WATERFALL, False)
   return 0
 
 if __name__ == "__main__":
   sys.exit(main())