Revert 177087.

tools/telemetry/telemetry/tab_unittest.py

Index: tools/telemetry/telemetry/tab_unittest.py
===================================================================
--- tools/telemetry/telemetry/tab_unittest.py	(revision 177224)
+++ tools/telemetry/telemetry/tab_unittest.py	(working copy)
@@ -1,8 +1,6 @@
 # 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 os
-
 from telemetry import tab_test_case
 from telemetry import tab_crash_exception
 from telemetry import util
@@ -10,8 +8,7 @@
 
 def _IsDocumentVisible(tab):
   state = tab.runtime.Evaluate('document.webkitVisibilityState')
-  # TODO(dtu): Remove when crbug.com/166243 is fixed.
-  tab._backend._Disconnect()  # pylint: disable=W0212
+  tab.Disconnect()
   return state == 'visible'
 
 
@@ -43,24 +40,3 @@
     util.WaitFor(lambda: _IsDocumentVisible(self._tab), timeout=5)
     self.assertFalse(_IsDocumentVisible(new_tab))
 
-
-class GpuTabTest(tab_test_case.TabTestCase):
-  def setUp(self):
-    self._extra_browser_args = ['--enable-gpu-benchmarking']
-    super(GpuTabTest, self).setUp()
-
-  def testScreenshot(self):
-    unittest_data_dir = os.path.join(os.path.dirname(__file__),
-                                     '..', 'unittest_data')
-    self._browser.SetHTTPServerDirectory(unittest_data_dir)
-    self._tab.page.Navigate(
-      self._browser.http_server.UrlOf('green_rect.html'))
-    self._tab.WaitForDocumentReadyStateToBeComplete()
-
-    # Skip this test if running against a browser without screenshot support
-    if self._tab.screenshot_supported:
-      screenshot = self._tab.Screenshot(5)
-      assert screenshot
-      screenshot.GetPixelColor(0, 0).AssertIsRGB(0, 255, 0)
-      screenshot.GetPixelColor(31, 31).AssertIsRGB(0, 255, 0)
-      screenshot.GetPixelColor(32, 32).AssertIsRGB(255, 255, 255)