[DevTools] Reenabled DevToolsSanityTest.TestConsoleOnNavigateBack.

BUG=260341

Review URL: https://codereview.chromium.org/98343003

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@238698 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 238698