[Cleanup] Remove Screenshot measurement test from telemetry

tools/perf/measurements/screenshot_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 logging
-import shutil
-import tempfile
-
-from measurements import screenshot
-from telemetry import benchmark
-from telemetry.page import page_test
-from telemetry.unittest_util import options_for_unittests
-from telemetry.unittest_util import page_test_test_case
-
-
-class ScreenshotUnitTest(page_test_test_case.PageTestTestCase):
-  def setUp(self):
-    self._options = options_for_unittests.GetCopy()
-    self._png_outdir = tempfile.mkdtemp('_png_test')
-
-  def tearDown(self):
-    shutil.rmtree(self._png_outdir)
-
-  @benchmark.Disabled('win')  # http://crbug.com/386572
-  def testScreenshot(self):
-    ps = self.CreatePageSetFromFileInUnittestDataDir('blank.html')
-    measurement = screenshot.Screenshot(self._png_outdir)
-    try:
-      results = self.RunMeasurement(measurement, ps, options=self._options)
-    except page_test.TestNotSupportedOnPlatformError as e:
-      logging.warning(e)
-      return
-
-    saved_picture_count = results.FindAllPageSpecificValuesNamed(
-        'saved_picture_count')
-    self.assertEquals(len(saved_picture_count), 1)
-    self.assertGreater(saved_picture_count[0].GetRepresentativeNumber(), 0)