Remove mojo/tools/, not needed in chromium

mojo/tools/run_mojo_python_bindings_tests.py

-#!/usr/bin/env python
-# 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.
-
-import os
-import sys
-
-_script_dir = os.path.dirname(os.path.abspath(__file__))
-sys.path.insert(0, os.path.join(_script_dir, "pylib"))
-
-from mojo_python_tests_runner import MojoPythonTestRunner
-
-
-class PythonBindingsTestRunner(MojoPythonTestRunner):
-
-  def add_custom_commandline_options(self, parser):
-    parser.add_argument('--build-dir', action='store',
-                        help='path to the build output directory')
-
-  def apply_customization(self, args):
-    if args.build_dir:
-      python_build_dir = os.path.join(args.build_dir, 'python')
-      if python_build_dir not in sys.path:
-        sys.path.append(python_build_dir)
-      python_gen_dir = os.path.join(
-          args.build_dir,
-          'gen', 'mojo', 'public', 'interfaces', 'bindings', 'tests')
-      if python_gen_dir not in sys.path:
-        sys.path.append(python_gen_dir)
-
-
-def main():
-  runner = PythonBindingsTestRunner(os.path.join('mojo', 'python', 'tests'))
-  sys.exit(runner.run())
-
-
-if __name__ == '__main__':
-  sys.exit(main())