Fix hints and clean-up obsolete comment syntax (TBR)

pkg/analysis_server/tool/instrumentation/page/stats_page.dart

 // Copyright (c) 2016, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 import '../log/log.dart';
 import 'page_writer.dart';
 
 /**
  * A page writer that will produce the page containing statistics about an
  * instrumentation log.
@@ skipping 71 matching lines @@
   int _mean(List<int> values) {
     int sum = values.fold(0, (int sum, int latency) => sum + latency);
     return sum ~/ values.length;
   }
 
   /**
    * Return a table mapping the kinds of the given [entries] to the number of
    * each kind.
    */
   void _processEntries(List<LogEntry> entries) {
-    void increment/*<K>*/(Map<dynamic/*=K*/, int> map, dynamic/*=K*/ key) {
+    void increment<K>(Map<K, int> map, K key) {
       map[key] = (map[key] ?? 0) + 1;
     }
 
     for (LogEntry entry in entries) {
       String kind = entry.kind;
       increment(entryCounts, kind);
       if (entry is ResponseEntry) {
         if (entry.result('error') != null) {
           errorCount++;
         }
@@ skipping 153 matching lines @@
           sink.write(responseTimes[responseTimes.length - 1]);
           sink.write('</td><td>');
           sink.write(method);
           sink.writeln('</td></tr>');
         }
         sink.writeln('</table>');
       });
     }
   }
 }