Treat .txt files as 'source' files (to enforce LF and line length)

Review URL: http://codereview.chromium.org/174210


git-svn-id: svn://svn.chromium.org/chrome/trunk/tools/depot_tools@24100 0039d316-1c4b-4281-b951-d872f2087c98

presubmit_support.py

@@ -155,7 +155,7 @@ class InputApi(object):
       # No extension at all
       r"(^|.*[\\\/])[^.]+$",
       # Other
-      r".*\.java", r".*\.mk", r".*\.am",
+      r".*\.java", r".*\.mk", r".*\.am", r".*\.txt",
   )
 
   # Path regexp that should be excluded from being considered containing source