Remove @Deprecated marker from getCoyoteResponse() method
as it has been resurrected in trunk in r1358055.

It is currently used by RewriteValve in trunk
and can be useful to valves to allow access to response.getCoyoteResponse().getMimeHeaders().

git-svn-id: https://svn.apache.org/repos/asf/tomcat/tc7.0.x/trunk@1489561 13f79535-47bb-0310-9956-ffa450edef68