Revert 158367 "Improve 'ContainerNode' exception messages."

This CL caused major perf regressions in the Blink perf tests.

> Improve 'ContainerNode' exception messages.
> 
> BUG=270033
> 
> Review URL: https://chromiumcodereview.appspot.com/23889039

BUG=299725
TBR=mkwst@chromium.org

Review URL: https://codereview.chromium.org/25083002

git-svn-id: svn://svn.chromium.org/blink/trunk@158453 bbb929c8-8fbe-4397-9dbb-9b2b20218538