Remove methods on StackTrace class.

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 {
-  // Returns a String object that contains the full stack trace starting from
-  // the point where an exception has ocurred to the entry function which is
-  // typically 'main'.
-  // 'toString()' on a stack trace object essentially invokes this getter.
-  external String get fullStackTrace;
-
-  // Returns a String object that contains a stack trace starting from the
-  // point where an exception has ocurred to the point where the exception
-  // is caught.
-  external String get stackTrace;
+  /**
+   * Returns a [String] representation of the stack trace.
+   *
+   * The string represents the full stack trace starting from
+   * the point where a throw ocurred to the top of the current call sequence.
+   *
+   * The exact format of the string representation is not final.
+   */
+  String toString();
 }