Clean up hints

pkg/analysis_server/tool/instrumentation/page/log_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 'dart:collection';
 import 'dart:math' as math;
 
 import '../log/log.dart';
 import '../server.dart';
 import 'page_writer.dart';
 
 /**
  * A page writer that will produce the page containing access to the full
  * content of the log.
  */
@@ skipping 258 matching lines @@
   void _writeRightColumn(StringSink sink) {
     //
     // Write the header of the column.
     //
     sink.writeln('<div class="columnHeader">');
     sink.writeln('<p><b>Entry Details</b></p>');
     sink.writeln('</div>');
     sink.writeln('<div id="details"></div>');
   }
 }