Restructure pkg/unittest and pkg/webdriver to follow the pub conventions.

pkg/fixnum/test/int_64_vm_test.dart

Index: pkg/fixnum/test/int_64_vm_test.dart
===================================================================
--- pkg/fixnum/test/int_64_vm_test.dart	(revision 14313)
+++ pkg/fixnum/test/int_64_vm_test.dart	(working copy)
@@ -4,11 +4,11 @@
 
 // A test to compare the results of the fixnum library with the Dart VM
 
-#library('int64vmtest');
-#import('dart:math', prefix: 'Math');
-#source('../intx.dart');
-#source('../int32.dart');
-#source('../int64.dart');
+library int64vmtest;
+import 'dart:math', prefix: 'Math';
+part '../intx.dart';
+part '../int32.dart';
+part '../int64.dart';
 
 void main() {
   int64VMTest test = new int64VMTest();