Stop working around issue 17083 in stack_trace.

pkg/stack_trace/lib/src/frame.dart

Index: pkg/stack_trace/lib/src/frame.dart
diff --git a/pkg/stack_trace/lib/src/frame.dart b/pkg/stack_trace/lib/src/frame.dart
index 5b376e2eee86a97c55a03d96ea8adca573398bdd..b1db23042128acef68aad571b4cb854c6e1e4eb8 100644
--- a/pkg/stack_trace/lib/src/frame.dart
+++ b/pkg/stack_trace/lib/src/frame.dart
@@ -47,15 +47,6 @@ final _friendlyFrame = new RegExp(
 
 final _initialDot = new RegExp(r"^\.");
 
-/// "dart:" libraries that are incorrectly reported without a "dart:" prefix.
-///
-/// See issue 11901. All these libraries should be in "dart:io".
-final _ioLibraries = new Set.from([
-  new Uri(path: 'timer_impl.dart'),
-  new Uri(path: 'http_impl.dart'),
-  new Uri(path: 'http_parser.dart')
-]);
-
 /// A single stack frame. Each frame points to a precise location in Dart code.
 class Frame {
   /// The URI of the file in which the code is located.
@@ -135,7 +126,6 @@ class Frame {
     // always be found. The column is optional.
     var member = match[1].replaceAll("<anonymous closure>", "<fn>");
     var uri = Uri.parse(match[2]);
-    if (_ioLibraries.contains(uri)) uri = Uri.parse('dart:io/${uri.path}');
     var line = int.parse(match[3]);
     var column = null;
     var columnMatch = match[4];