Re-enable pyauto test: testDefaultSearchEngines

Ran 100 times without failure.

R=dennisjeffrey@chromium.org
BUG=99944
TEST=

Review URL: http://codereview.chromium.org/8666004

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@111257 0039d316-1c4b-4281-b951-d872f2087c98

chrome/test/functional/PYAUTO_TESTS

@@ -106,8 +106,6 @@
       '-popups.PopupsTest.testUnblockedPopupAddedToOmnibox',
       # crbug.com/85600
       '-prefs.PrefsTest.testNavigationStateOnSessionRestore',
-      # Flaky browser crash.  crbug.com/99944
-      '-search_engines.SearchEnginesTest.testDefaultSearchEngines',
       # Flaky: crbug.com/67851
       '-special_tabs.SpecialTabsTest.testAboutDNSTab',
       # crbug.com/102517 -- external webpage throws 500