Change CEF version number format to remove SVN dependency (issue #1580).

tools/commit_number.py

@@ -0,0 +1,17 @@
+# Copyright (c) 2012 The Chromium Embedded Framework 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 git_util as git
+import os
+import sys
+
+# cannot be loaded as a module
+if __name__ != "__main__":
+    sys.stderr.write('This file cannot be loaded as a module!')
+    sys.exit()
+
+if git.is_checkout('.'):
+  sys.stdout.write(git.get_commit_number())
+else:
+  raise Exception('Not a valid checkout')