Enable testContentHistory in pyAuto.

BUG=91030
TEST=ran on qa-bots for win7 and Vista
Review URL: http://codereview.chromium.org/7966023

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@102399 0039d316-1c4b-4281-b951-d872f2087c98

chrome/test/functional/PYAUTO_TESTS

@@ -111,8 +111,6 @@
       '-cookies.CookiesTest.testAllowCookiesForASessionUsingExceptions',
       '-cookies.CookiesTest.testAllowCookiesUsingExceptions',
       '-cookies.CookiesTest.testBlockCookiesUsingExceptions',
-      # crbug.com/91030
-      '-omnibox.OmniboxTest.testContentHistory',
       # crbug.com/86524
       '-plugins.PluginsTest.testAllowPluginException',
       # crbug.com/87811