Remove old isolate API and update all code in the repository to use

tests/isolate/spawn_uri_negative_test.dart

Index: tests/isolate/spawn_uri_negative_test.dart
diff --git a/tests/isolate/v2_spawn_uri_negative_test.dart b/tests/isolate/spawn_uri_negative_test.dart
similarity index 88%
rename from tests/isolate/v2_spawn_uri_negative_test.dart
rename to tests/isolate/spawn_uri_negative_test.dart
index 1ff2916f9d584159f39e13be99a2d3d2a214a0e4..22033bfe0bdde1fceea6e5c95df692e5533ad408 100644
--- a/tests/isolate/v2_spawn_uri_negative_test.dart
+++ b/tests/isolate/spawn_uri_negative_test.dart
@@ -5,7 +5,7 @@
 // Negative test to make sure that we are reaching all assertions.
 // Note: the following comment is used by test.dart to additionally compile the
 // other isolate's code.
-// OtherScripts=v2_spawn_uri_child_isolate.dart
+// OtherScripts=spawn_uri_child_isolate.dart
 #library('spawn_tests');
 #import('../../lib/unittest/unittest.dart');
 #import('dart:isolate');
@@ -19,7 +19,7 @@ main() {
     }));
 
     // TODO(eub): make this work for non-JS targets.
-    SendPort s = spawnUri('v2_spawn_uri_child_isolate.js');
+    SendPort s = spawnUri('spawn_uri_child_isolate.js');
     s.send('hi', port.toSendPort());
   });
 }