Remove old commented out cache configuration code

Signed-off-by: Shawn O. Pearce <sop@google.com>

src/main/java/com/google/gerrit/server/cache/CachePool.java

@@ -141,10 +141,6 @@ public class CachePool {
         mgr.addCache(c);
       }
 
-      // mgr.addCache(disk(named("diff")));
-      // mgr.addCache(disk(tti(named("web_sessions"), D_SESSIONAGE)));
-      // mgr.addCache(ttl(named("openid"), 5));
-
       return mgr;
     }