Fix pyauto downloads tests to trigger dangerous downloads to match expectation

chrome/test/functional/PYAUTO_TESTS

 # Copyright (c) 2010 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 62 matching lines @@
   'win': [
     # testBookmarkBarVisible fails on windows. crbug.com/42823
     '-bookmark_bar.BookmarkBarTest.testBookmarkBarVisible',
     # crbug.com/64664
     '-databases.DatabasesTest.testReloadActiveTab',
     # Some download test fails on win official builder, only thru buildbot when
     # downloading the small zip file.
     # crbug.com/50481, crbug.com/54942
     '-downloads.DownloadsTest.testZip',
     '-downloads.DownloadsTest.testRemoveDownload',
-    # Unsafe downloads tests broken. crbug.com/66081
-    '-downloads.DownloadsTest.testDeclineDangerousDownload',
-    '-downloads.DownloadsTest.testNoUnsafeDownloadsOnRestart',
     '-prefs.PrefsTest.testDownloadDirPref',
     # crbug.com/64269
     '-passwords.PasswordTest.testDisplayAndSavePasswordInfobar',
   ],
 
   'mac': [
     # Keychain popups make password & autofill tests difficult. crbug.com/49378
     '-passwords',
     '-autofill',
     # codesign tests should run *after* signing. crbug.com/50481
     '-codesign',
     '-content.ContentTest.testThreeWindows',  # crbug.com/47457
-    '-downloads.DownloadsTest.testSaveDangerousFile',  # crbug.com/57875
-    # Unsafe downloads tests broken. crbug.com/66081
-    '-downloads.DownloadsTest.testDeclineDangerousDownload',
-    '-downloads.DownloadsTest.testNoUnsafeDownloadsOnRestart',
   ],
 
   'linux': [  # linux != chromeos
     '-browser.BrowserTest.testWindowResize',  # crbug.com/44963
     '-browser.BrowserTest.testFlashLoadsAfterKill',  # crbug.com/63039
     '-content.ContentTest.testThreeWindows',  # crbug.com/47457
     # crbug.com/64664
     '-databases.DatabasesTest.testReloadActiveTab',
-    # Unsafe downloads tests broken. crbug.com/66081
-    '-downloads.DownloadsTest.testDeclineDangerousDownload',
-    '-downloads.DownloadsTest.testNoUnsafeDownloadsOnRestart',
-    '-downloads.DownloadsTest.testSaveDangerousFile',
     # crbug.com/64269
     '-passwords.PasswordTest.testDisplayAndSavePasswordInfobar',
   ],
 
   # ChromeOS is linux, but note that this section does not include the
   # entries in the linux section above.
   'chromeos': [
     # you cannot resize browser window on chromeos
     '-browser.BrowserTest.testWindowResize',
     # Importer tests are invalid on chromeos since chrome is the only browser
@@ skipping 17 matching lines @@
     '-downloads.DownloadsTest.testZipInIncognito',
     '-downloads.DownloadsTest.testCrazyFilenames',
     '-downloads.DownloadsTest.testBigZip',
     '-downloads.DownloadsTest.testCancelDownload',
     '-downloads.DownloadsTest.testPauseAndResume',
     '-translate.TranslateTest.testDownloadsNotTranslated',
     # crosbug.com/9499
     '-crash_reporter.CrashReporterTest.testRendererCrash',
     # crbug.com/64269
     '-passwords.PasswordTest.testDisplayAndSavePasswordInfobar',
-    # Unsafe downloads tests broken. crbug.com/66081
-    '-downloads.DownloadsTest.testDeclineDangerousDownload',
-    '-downloads.DownloadsTest.testSaveDangerousFile',
   ],
 }