Fix import order with isort tool.

tools/telemetry/telemetry/core/browser_options_unittest.py

 # Copyright 2012 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.
 import optparse
 import os
 import unittest
 
 from telemetry.core import browser_options
 
+
 class BrowserOptionsTest(unittest.TestCase):
   def testDefaults(self):
     options = browser_options.BrowserFinderOptions()
     parser = options.CreateParser()
     parser.add_option('-x', action='store', default=3)
     parser.parse_args(['--browser', 'any'])
     self.assertEquals(options.x, 3) # pylint: disable=E1101
 
   def testDefaultsPlusOverride(self):
     options = browser_options.BrowserFinderOptions()
@@ skipping 88 matching lines @@
 
     options.MergeDefaultValues(parser.get_default_values())
 
     self.assertTrue(options.already_true)
     self.assertFalse(options.already_false)
     self.assertTrue(options.unset is None)
     self.assertTrue(options.default_true)
     self.assertFalse(options.default_false)
     self.assertFalse(options.override_to_true)
     self.assertTrue(options.override_to_false)