[Telemetry] Clean separation between tab (public API) and tab_backend (Chrome implementation). Flat…

tools/telemetry/telemetry/tab_test_case.py

 # Copyright (c) 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 unittest
 
 from telemetry import browser_finder
 from telemetry import options_for_unittests
 
 class TabTestCase(unittest.TestCase):
   def __init__(self, *args):
@@ skipping 16 matching lines @@
       raise Exception('No browser found, cannot continue test.')
     try:
       self._browser = browser_to_create.Create()
       self._tab = self._browser.tabs[0]
     except:
       self.tearDown()
       raise
 
   def tearDown(self):
     if self._tab:
-      self._tab.Disconnect()
+      self._tab.Close()
     if self._browser:
       self._browser.Close()
 
   def CustomizeBrowserOptions(self, options):
     """Override to add test-specific options to the BrowserOptions object"""
     pass