--- a/chromium/tools/grit/grit/util.py
+++ b/chromium/tools/grit/grit/util.py
@@ -209,7 +209,7 @@ def ReadFile(filename, encoding):
     mode = 'rb'
     encoding = None
   else:
-    mode = 'rU'
+    mode = 'r'
 
   with io.open(filename, mode, encoding=encoding) as f:
     return f.read()
--- a/chromium/PRESUBMIT_test_mocks.py
+++ b/chromium/PRESUBMIT_test_mocks.py
@@ -129,7 +129,7 @@ class MockInputApi(object):
   def PresubmitLocalPath(self):
     return self.presubmit_local_path
 
-  def ReadFile(self, filename, mode='rU'):
+  def ReadFile(self, filename, mode='r'):
     if hasattr(filename, 'AbsoluteLocalPath'):
        filename = filename.AbsoluteLocalPath()
     for file_ in self.files: