Remove ".orig" files and add a check to presubmit

catapult_build/repo_checks.py

+# Copyright 2016 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.
+
+"""Checks to use in PRESUBMIT.py for general repository violations."""
+
+
+def RunChecks(input_api, output_api):
+  orig_files = [f.LocalPath()
+                for f in input_api.AffectedFiles(include_deletes=False)
+                if f.LocalPath().endswith('.orig')]
+  if orig_files:
+    return [output_api.PresubmitError(
+        'Files with ".orig" suffix must not be checked into the '
+        'repository:\n  ' + '\n  '.join(orig_files))]
+  else:
+    return []