Revert 43962 - Adds a safety check for DOM UI renderers.

      (Currently crashing on reliability bot.)

We should not be passing web URLs to DOM UI renderers.  This CL adds a
check to ensure that we only navigate to DOM UI URLs in such renderers.

BUG=40575
TEST=none

Review URL: http://codereview.chromium.org/1549027

TBR=brettw
Review URL: http://codereview.chromium.org/1626012

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@44100 0039d316-1c4b-4281-b951-d872f2087c98