Clean up logging in MB.

tools/mb/mb_unittest.py

 #!/usr/bin/python
 # Copyright 2015 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.
 
 """Tests for mb.py."""
 
 import json
 import StringIO
 import sys
@@ skipping 20 matching lines @@
 
   def Exists(self, path):
     return self.files.get(path) is not None
 
   def MaybeMakeDirectory(self, path):
     pass
 
   def ReadFile(self, path):
     return self.files[path]
 
-  def WriteFile(self, path, contents):
+  def WriteFile(self, path, contents, force_verbose=False):
     self.files[path] = contents
 
   def Call(self, cmd, env=None):
     if env:
       self.cross_compile = env.get('GYP_CROSSCOMPILE')
     self.calls.append(cmd)
     if self.cmds:
       return self.cmds.pop(0)
     return 0, '', ''
 
@@ skipping 223 matching lines @@
     finally:
       sys.stdout = orig_stdout
 
 
   def test_validate(self):
     self.check(['validate'], ret=0)
 
 
 if __name__ == '__main__':
   unittest.main()