Refactor pkg/path.

pkg/stack_trace/test/vm_test.dart

Index: pkg/stack_trace/test/vm_test.dart
diff --git a/pkg/stack_trace/test/vm_test.dart b/pkg/stack_trace/test/vm_test.dart
index 6570c24c5ccc9367a2208497b0b7278b93b7af49..7e00b7a61cd7ff9213917335d04752405fd54086 100644
--- a/pkg/stack_trace/test/vm_test.dart
+++ b/pkg/stack_trace/test/vm_test.dart
@@ -43,16 +43,14 @@ void main() {
     test('.parse parses a real stack trace correctly', () {
       var string = getStackTraceString();
       var trace = new Trace.parse(string);
-      var builder = new path.Builder(style: path.Style.url);
-      expect(builder.basename(trace.frames.first.uri.path),
+      expect(path.url.basename(trace.frames.first.uri.path),
           equals('vm_test.dart'));
       expect(trace.frames.first.member, equals('getStackTraceString'));
     });
 
     test('converts from a native stack trace correctly', () {
       var trace = new Trace.from(getStackTraceObject());
-      var builder = new path.Builder(style: path.Style.url);
-      expect(builder.basename(trace.frames.first.uri.path),
+      expect(path.url.basename(trace.frames.first.uri.path),
           equals('vm_test.dart'));
       expect(trace.frames.first.member, equals('getStackTraceObject'));
     });