[css-pseudo] Remove issue 7, as impls have shipped long enough that bikeshedding is unproductive.

Author: tabatkins

css-pseudo/Overview.bs

@@ -721,15 +721,6 @@ Placeholder Input: the ''::placeholder'' pseudo-element</h3>
   Note that in static media (such as print)
   placeholder text will be present even after the user has entered input.
 
-  Issue: Current bikeshedding, based on implementations and discussions,
-  appears to select from the list
-  <code>::placeholder</code>,
-  <code>::placeholder-text</code>,
-  <code>::input-placeholder</code>.
-  The WG is going with <code>::placeholder</code>.
-  If there are other opinions that provide some kind of argument to the contrary,
-  they should go to <a href="http://lists.w3.org/Archives/Public/www-style/">www-style@w3.org</a>.
-
   Issue: Authors seem to want 'text-align' on the list of supported properties.
   See e.g. <a href="http://css-tricks.com/almanac/selectors/p/placeholder/">comments here</a>.