Format all dart: library files

sdk/lib/core/stacktrace.dart

 // Copyright (c) 2013, 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.
 
 part of dart.core;
 
 /**
  * An interface implemented by all stack trace objects.
  *
  * A [StackTrace] is intended to convey information to the user about the call
  * sequence that triggered an exception.
  *
  * These objects are created by the runtime, it is not possible to create
  * them programmatically.
  */
 abstract class StackTrace {
-  StackTrace();  // In case existing classes extend StackTrace.
+  StackTrace(); // In case existing classes extend StackTrace.
 
   /**
    * Create a `StackTrace` object from [stackTraceString].
    *
    * The created stack trace will have a `toString` method returning
    * `stackTraceString`.
    *
    * The `stackTraceString` can be a string returned by some other
    * stack trace, or it can be any string at all.
    * If the string doesn't look like a stack trace, code that interprets
@@ skipping 23 matching lines @@
    * The exact format of the string representation is not final.
    */
   String toString();
 }
 
 class _StringStackTrace implements StackTrace {
   final String _stackTrace;
   _StringStackTrace(this._stackTrace);
   String toString() => _stackTrace;
 }