Remove methods on StackTrace class.

sdk/lib/core/stacktrace.dart

Index: sdk/lib/core/stacktrace.dart
diff --git a/sdk/lib/core/stacktrace.dart b/sdk/lib/core/stacktrace.dart
index a82a8402bd1aa28de72502054479cee9d04da6a2..ef8cc4dbb4adfac17f33fef5f28d31fe15d45a2c 100644
--- a/sdk/lib/core/stacktrace.dart
+++ b/sdk/lib/core/stacktrace.dart
@@ -14,15 +14,14 @@ part of dart.core;
  * 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();
 }