[chromedriver] Return false for databaseEnabled as database is not supported yet.

BUG=none

Review URL: https://codereview.chromium.org/26715003

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@227853 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 227853