[chromedriver] Stop supporting chrome 26. Don't run tests against it.

chrome/test/chromedriver/test_expectations

 # Copyright (c) 2013 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.
 
 """Test expectation list for WebDriver Java acceptance tests.
 
 It is evaluated through Python.
 """
 
 import fnmatch
@@ skipping 71 matching lines @@
     'TypingTest.testShouldNotTypeIntoElementsThatPreventKeyDownEvents',
     'TypingTest.testTypingIntoAnIFrameWithContentEditableOrDesignModeSet',
     'UnexpectedAlertBehaviorTest.*',
     'VisibilityTest.testElementHiddenByOverflowXIsNotVisible',
     'VisibilityTest.testElementHiddenByOverflowYIsNotVisible',
     'VisibilityTest.tooSmallAWindowWithOverflowHiddenIsNotAProblem',
     'WindowTest.*',
 ]
 _REVISION_NEGATIVE_FILTER['28'] = [] + _REVISION_NEGATIVE_FILTER['HEAD']
 _REVISION_NEGATIVE_FILTER['27'] = [] + _REVISION_NEGATIVE_FILTER['HEAD']
-_REVISION_NEGATIVE_FILTER['26'] = [
-    'AlertsTest.testHandlesTwoAlertsFromOneInteraction',
-    'AlertsTest.testShouldAllowAUserToSetTheValueOfAPrompt',
-    'UploadTest.testFileUploading',
-    'CorrectEventFiringTest.testUploadingFileShouldFireOnChangeEvent',
-    'FormHandlingTest.testShouldBeAbleToAlterTheContentsOfAFileUploadInputElement',
-    'FormHandlingTest.testShouldBeAbleToUploadTheSameFileTwice',
-    'FormHandlingTest.testShouldBeAbleToSendKeysToAFileUploadInputElementInAnXhtmlDocument',
-] + _REVISION_NEGATIVE_FILTER['HEAD']
 
 _OS_NEGATIVE_FILTER = {}
 _OS_NEGATIVE_FILTER['win'] = [
     # Flaky: https://code.google.com/p/chromedriver/issues/detail?id=282
     'PageLoadingTest.testShouldNotHangIfDocumentOpenCallIsNeverFollowedByDocumentCloseCall',
 ]
 _OS_NEGATIVE_FILTER['linux'] = []
 _OS_NEGATIVE_FILTER['mac'] = [
     # https://code.google.com/p/chromedriver/issues/detail?id=26
     'AlertsTest.testAlertShouldNotAllowAdditionalCommandsIfDismissed',
@@ skipping 116 matching lines @@
 
   Returns:
     Set of passed test names.
   """
   filters = (_OS_NEGATIVE_FILTER[operating_system] +
              _REVISION_NEGATIVE_FILTER[chrome_version])
   passed = set(tests)
   for f in filters:
     passed.difference_update(set(t for t in tests if fnmatch.fnmatch(t, f)))
   return passed