Fix import order with isort tool.

tools/telemetry/telemetry/web_components/web_component_unittest.py

 # Copyright 2014 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 StringIO
 import unittest
-import StringIO
 
 from telemetry.web_components import web_component
 
+
 class SimpleWebComponent(web_component.WebComponent):
   def __init__(self):
     super(SimpleWebComponent, self).__init__(
       tvcm_module_name='telemetry.web_components.viewer_unittest_data',
       js_class_name='telemetry.web_components.SimpleWebComponent',
       data_binding_property='dataToView')
 
   def WriteDataToFileAsJson(self, f):
     f.write("1\n")
 
 class WebComponentTests(unittest.TestCase):
   def testForSmoke(self):
     v = SimpleWebComponent()
 
     f = StringIO.StringIO()
     v.WriteWebComponentToFile(f)
 
   def testRead(self):
     v = SimpleWebComponent()
 
     f = StringIO.StringIO()
     v.WriteWebComponentToFile(f)
 
     f.seek(0)
 
     data = SimpleWebComponent.ReadDataObjectFromWebComponentFile(f)
     self.assertEquals(data, 1)