Forcibly disable MacVDA, even for users who ignore the GPU blacklist.

chrome/test/functional/PYAUTO_TESTS

 # 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.
 #
 # This file lists the pyauto tests that run as a part of the functional test
 # suite.
 #
 # Tests can be enabled on a per-platform basis. Tests not listed here will
 # not be run.
 #
@@ skipping 136 matching lines @@
       # crbug.com/113090
       '-extensions.ExtensionsTest.testAllowIncognitoExtension',
       # crbug.com/94682
       '-gpu.GpuTest.test2dCanvas',
       # Disabled on vista in the actual test. crbug.com/89767
       # -imports.ImportsTest.testImportFirefoxDataTwice
       # Disabled on vista in the actual test. crbug.com/89767
       # -imports.ImportsTest.testFirefoxImportFromPrefs
       # Disabled on vista in the actual test. crbug.com/89767
       # -imports.ImportsTest.testImportFirefoxPasswordsFromPrefs
-      # crbug.com/125424
-      '-media.media_basic_playback.MediaBasicPlaybackTest.testBasicPlaybackMatrix',
       # crbug.com/95031
       '-notifications.NotificationsTest.testOriginPrefsNotSavedInIncognito',
       # crbug.com/117569
       '-passwords.PasswordTest.testSavedPasswordInTabsAndWindows',
       # crbug.com/98526
       '-pyauto_webdriver.PyAutoWebDriverTest.testCanConnectToRestartedBrowser',
       '-pyauto_webdriver.PyAutoWebDriverTest.testTypeIntoTextBox',
       # Disable sync.SyncIntegrationTest on the QA bots in FULL,
       # until sync protobufs are copied over.
       # Also, see crbug.com/104227
@@ skipping 20 matching lines @@
       '-codesign',
       # crbug.com/124922
       '-fullscreen_mouselock.FullscreenMouselockTest.testMouseLockExitWhenBrowserLoseFocus',
       # crbug.com/125989
       '-fullscreen_mouselock.FullscreenMouselockTest.testMouseLockExitWhenAlertDialogShow',
       # Fails on chrome-mac-10_7-qa only: crbug.com/124886
       '-fullscreen_mouselock.FullscreenMouselockTest.testPrefsForFullscreenExit',
       '-fullscreen_mouselock.FullscreenMouselockTest.testNoMouseLockWhenCancelFS',
       # crbug.com/114244
       '-imports.ImportsTest.testImportSafariDataTwice',
-      # crbug.com/157394
-      '-media.media_basic_playback.MediaBasicPlaybackTest.testBasicPlaybackMatrix',
       # crbug.com/121484
       '-multiprofile.MultiprofileTest.test20NewProfiles',
       '-ntp.NTPTest.testLaunchAppNewWindow',  # crbug.com/79812
       # Causes browser crash.  crbug.com/93548
       '-notifications.NotificationsTest.testIncognitoNotification',
       '-notifications.NotificationsTest.testOriginPrefsNotSavedInIncognito',
       '-notifications.NotificationsTest.testNotificationOrderAfterClosingOne',
       # crbug.com/70437
       '-omnibox.OmniboxTest.testHistoryResult',
       # crbug.com/91617
@@ skipping 384 matching lines @@
       '-search_engines.SearchEnginesTest.testDiscoverSearchEngine',
       '-ntp.NTPTest.testUninstallApp',
       '-ntp.NTPTest.testLaunchAppWithDefaultSettings',
       '-ntp.NTPTest.testLaunchAppRegularTab',
       '-ntp.NTPTest.testLaunchAppPinnedTab',
       '-ntp.NTPTest.testGetAppsWhenInstallApp',
       '-ntp.NTPTest.testLaunchAppNewWindow',
     ],
   },
 }