Remove tests of a workaround that no longer exists in stack_trace.

pkg/stack_trace/test/frame_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.
 
 library frame_test;
 
 import 'package:path/path.dart' as path;
 import 'package:stack_trace/stack_trace.dart';
 import 'package:unittest/unittest.dart';
 
@@ skipping 12 matching lines @@
     test('parses a stack frame without column correctly', () {
       var frame = new Frame.parseVM("#1      Foo._bar "
           "(file:///home/nweiz/code/stuff.dart:24)");
       expect(frame.uri,
           equals(Uri.parse("file:///home/nweiz/code/stuff.dart")));
       expect(frame.line, equals(24));
       expect(frame.column, null);
       expect(frame.member, equals('Foo._bar'));
     });
 
-    test('parses a stack frame with timer_impl correctly', () {
-      var frame = new Frame.parseVM("#1      Foo._bar "
-          "(timer_impl.dart:24)");
-      expect(frame.uri, equals(Uri.parse("dart:io/timer_impl.dart")));
-      expect(frame.line, equals(24));
-      expect(frame.column, null);
-      expect(frame.member, equals('Foo._bar'));
-    });
-
-    test('parses a stack frame with http_parser correctly', () {
-      var frame = new Frame.parseVM("#1      Foo._bar "
-          "(http_parser.dart:24)");
-      expect(frame.uri, equals(Uri.parse("dart:io/http_parser.dart")));
-      expect(frame.line, equals(24));
-      expect(frame.column, null);
-      expect(frame.member, equals('Foo._bar'));
-    });
-
-    test('parses a stack frame with http_impl correctly', () {
-      var frame = new Frame.parseVM("#1      Foo._bar "
-          "(http_impl.dart:24)");
-      expect(frame.uri, equals(Uri.parse("dart:io/http_impl.dart")));
-      expect(frame.line, equals(24));
-      expect(frame.column, null);
-      expect(frame.member, equals('Foo._bar'));
-    });
-
     test('converts "<anonymous closure>" to "<fn>"', () {
       String parsedMember(String member) =>
           new Frame.parseVM('#0 $member (foo:0:0)').member;
 
       expect(parsedMember('Foo.<anonymous closure>'), equals('Foo.<fn>'));
       expect(parsedMember('<anonymous closure>.<anonymous closure>.bar'),
           equals('<fn>.<fn>.bar'));
     });
 
     test('parses a folded frame correctly', () {
@@ skipping 484 matching lines @@
           equals('dart:core/uri.dart 5 in Foo'));
     });
 
     test('prints relative paths as relative', () {
       var relative = path.normalize('relative/path/to/foo.dart');
       expect(new Frame.parseFriendly('$relative 5:10  Foo').toString(),
           equals('$relative 5:10 in Foo'));
     });
   });
 }