pkg/isolate: library renaming, removed unused method, fix creation of TimeoutException

lib/src/errors.dart

 // Copyright (c) 2015, 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.
 
 // TODO(lrn): This should be in package:async?
 /// Helper functions for working with errors.
 ///
 /// The [MultiError] class combines multiple errors into one object,
 /// and the [MultiError.wait] function works like [Future.wait] except
 /// that it returns all the errors.
-library pkg.isolate.errors;
+library isolate.errors;
 
-import "dart:async";
+import 'dart:async';
 
 class MultiError extends Error {
   // Limits the number of lines included from each error's error message.
   // A best-effort attempt is made at keeping below this number of lines
   // in the output.
   // If there are too many errors, they will all get at least one line.
   static const int _MAX_LINES = 55;
   // Minimum number of lines in the toString for each error.
   static const int _MIN_LINES_PER_ERROR = 1;
 
@@ skipping 145 matching lines @@
       }
       buffer.write("#$index: ");
       buffer.write(errorString.substring(0, end));
       if (end < errorString.length) {
         buffer.write("...\n");
       }
     }
     return buffer.toString();
   }
 }