Remove python bindings unittests from the build.

mojo/mojo.gyp

 # Copyright 2013 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.
 
 {
   'target_defaults': {
     'conditions': [
       ['mojo_shell_debug_url != ""', {
         'defines': [
           'MOJO_SHELL_DEBUG=1',
@@ skipping 572 matching lines @@
           },
           'sources': [
             'public/python/mojo/__init__.py',
           ],
           'dependencies': [
             'mojo_python_embedder',
             'mojo_python_system',
           ],
           'includes': [ '../third_party/cython/python_module.gypi' ],
         },
-        {
-          'target_name': 'mojo_python_unittests',
-          'type': 'none',
-          'actions': [
-            {
-              'action_name': 'run_mojo_python_unittests',
-              'inputs': [
-                'python/tests/test_core.py',
-                '<(SHARED_INTERMEDIATE_DIR)/mojo_python_py_module.stamp',
-                '<(PRODUCT_DIR)/python/mojo/__init__.py',
-              ],
-              'outputs': [
-                'none',
-              ],
-              'action': [
-                'python', '<@(_inputs)', '<(PRODUCT_DIR)/python',
-              ],
-            },
-          ],
-          'dependency': [
-            'mojo_python',
-          ],
-        },
       ],
     }],
   ],
 }