Import OrderedDict from collections, not collections_abc

This was a mistake introduced in
https://chromium-review.googlesource.com/c/external/gyp/+/3536247 that
broke Windows breakpad build. See
https://github.com/chromium/gyp/commit/bc83cdacf5428ab6ddcc92fd0b0fc494cc9a4d4f#commitcomment-75762564

Bug: b/217559564
Change-Id: I3e44da6f4e40ad062106877f24021b5039a458b2
Reviewed-on: https://chromium-review.googlesource.com/c/external/gyp/+/3706740
Reviewed-by: Mark Mentovai <mark@chromium.org>
diff --git a/pylib/gyp/generator/msvs.py b/pylib/gyp/generator/msvs.py
index 8014ad1..263b312 100644
--- a/pylib/gyp/generator/msvs.py
+++ b/pylib/gyp/generator/msvs.py
@@ -11,8 +11,7 @@
 import re
 import subprocess
 import sys
-
-from six.moves import collections_abc
+import collections
 
 import gyp.common
 import gyp.easy_xml as easy_xml
@@ -196,7 +195,7 @@
   if not prefix: prefix = []
   result = []
   excluded_result = []
-  folders = collections_abc.OrderedDict()
+  folders = collections.OrderedDict()
   # Gather files into the final result, excluded, or folders.
   for s in sources:
     if len(s) == 1: