Update from https://crrev.com/306655

third_party/cython/cython_compiler.gypi

-# Copyright 2014 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.
-
-{
-  'variables': {
-    'python_flags': '<(DEPTH)/third_party/cython/python_flags.py',
-  },
-  'conditions': [
-    ['OS=="mac"', {
-      'variables': {
-        'module_prefix': '',
-        'module_suffix': '.so',
-      },
-    }, {
-      'variables': {
-        'module_prefix': '<(SHARED_LIB_PREFIX)',
-        'module_suffix': '<(SHARED_LIB_SUFFIX)',
-      },
-    }],
-  ],
-  'type': 'loadable_module',
-  'rules': [
-    {
-      'rule_name': '<(_target_name)_cython_compiler',
-      'extension': 'pyx',
-      'variables': {
-        'cython_compiler': '<(DEPTH)/third_party/cython/src/cython.py',
-      },
-      'inputs': [
-        '<(cython_compiler)',
-      ],
-      'outputs': [
-        '<(SHARED_INTERMEDIATE_DIR)/cython/<(python_base_module)/<(RULE_INPUT_ROOT).cc',
-      ],
-      'action': [
-        'python', '<(cython_compiler)',
-        '--cplus',
-        '-I<(DEPTH)',
-        '-o', '<@(_outputs)',
-        '<(RULE_INPUT_PATH)',
-      ],
-      'message': 'Generating C++ source from <(RULE_INPUT_PATH)',
-      'process_outputs_as_sources': 1,
-    }
-  ],
-  'include_dirs': [
-    '<!@(python <(python_flags) --includes)',
-    '<(DEPTH)',
-  ],
-  'libraries': [
-    '<!@(python <(python_flags) --libraries)',
-  ],
-  'cflags': [
-    '-Wno-unused-function',
-  ],
-  'xcode_settings': {
-    'WARNING_CFLAGS': [ '-Wno-unused-function' ],
-  },
-  'library_dirs': [
-    '<!@(python <(python_flags) --library_dirs)',
-  ],
-  'hard_dependency': 1,
-}