pkg/stack_trace: Use StackTrace.current

test/trace_test.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.
 
 import 'package:path/path.dart' as path;
 import 'package:stack_trace/stack_trace.dart';
 import 'package:test/test.dart';
 
-String getStackTraceString() {
-  try {
-    throw '';
-  } catch (_, stackTrace) {
-    return stackTrace.toString();
-  }
-}
-
-StackTrace getStackTraceObject() {
-  try {
-    throw '';
-  } catch (_, stackTrace) {
-    return stackTrace;
-  }
-}
-
 Trace getCurrentTrace([int level]) => new Trace.current(level);
 
 Trace nestedGetCurrentTrace(int level) => getCurrentTrace(level);
 
 void main() {
   // This just shouldn't crash.
   test('a native stack trace is parseable', () => new Trace.current());
 
   group('.parse', () {
     test('.parse parses a VM stack trace correctly', () {
@@ skipping 384 matching lines @@
 ''');
 
       expect(trace.foldFrames((frame) => true).toString(), equals(r'''
 .g"cs$#:b";a#>sw{*{ul$"$xqwr`p
 %+j-?uppx<([j@#nu{{>*+$%x-={`{
 !e($b{nj)zs?cgr%!;bmw.+$j+pfj~
 '''));
     });
   });
 }