Remove some more library directives

pkg/analysis_server/tool/instrumentation/log/log.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.
 
 /**
  * A representation of the contents of an instrumentation log.
  */
-library analysis_server.tool.instrumentation.log.log;
-
 import 'dart:convert';
 import 'dart:math' as math;
 
 import 'package:analyzer/instrumentation/instrumentation.dart';
 
 /**
  * A boolean-valued function of one argument.
  */
 typedef bool Predicate<T>(T value);
 
@@ skipping 910 matching lines @@
     int slash = context.lastIndexOf('/');
     if (slash < 0) {
       slash = context.lastIndexOf('\\');
     }
     if (slash >= 0) {
       String prefix = context.substring(0, slash);
       _target = _target.replaceAll(prefix, '...');
     }
   }
 }