Make gyp_chromium.py work with Python 2.7.

gyp_chromium.py contained a Python 2.6 Windows bug workaround which turns out to be harmful with Python 2.7 since it will just include itself without doing anything.

BUG=
R=scottmg@chromium.org

Review URL: https://codereview.chromium.org/14670009

git-svn-id: http://src.chromium.org/svn/trunk/src/build@202578 4ff67af0-8c30-449e-8e8b-ad334ec8d88c

gyp_chromium.py

@@ -1,9 +1,18 @@
-# Copyright 2012 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.
-
-# This is a workaround for multiprocessing on Windows. Importing in Python on
-# Windows doesn't search for imports that don't end in .py (and aren't
-# directories with an __init__.py). So, add this wrapper to avoid having
-# people change their command line to add a .py when running gyp_chromium.
-__import__('gyp_chromium')
+# Copyright 2012 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.
+
+# This file is (possibly, depending on python version) imported by
+# gyp_chromium when GYP_PARALLEL=1 and it creates sub-processes
+# through the multiprocessing library.
+
+# Importing in Python 2.6 (fixed in 2.7) on Windows doesn't search for
+# imports that don't end in .py (and aren't directories with an
+# __init__.py). This wrapper makes "import gyp_chromium" work with
+# those old versions and makes it possible to execute gyp_chromium.py
+# directly on Windows where the extension is useful.
+
+import os
+
+path = os.path.abspath(os.path.split(__file__)[0])
+execfile(os.path.join(path, 'gyp_chromium'))