Bring back initPolymer, allow boot.js only if using "polymer_experimental.html".

pkg/polymer/test/custom_event_test.dart

Index: pkg/polymer/test/custom_event_test.dart
diff --git a/pkg/polymer/test/custom_event_test.dart b/pkg/polymer/test/custom_event_test.dart
index 0b67e3e10eb1b1dcd4ec8d1bb43d458d5e2ab1af..b5840294848533777bec13dbac28def0c4a70441 100644
--- a/pkg/polymer/test/custom_event_test.dart
+++ b/pkg/polymer/test/custom_event_test.dart
@@ -42,8 +42,8 @@ class TestCustomEvent extends PolymerElement {
   barBazHandler(e) => events.add(['barbaz', e]);
 }
 
-@initMethod
 main() {
+  initPolymer();

[Jennifer Messerly, 2014/05/23 07:20:06]

I wonder if this should use the initPolymer.run(...) pattern?

(our old tests were kind of inconsistent -- and it often doesn't matter because
the test isn't testing data binding -- but might be nice to keep things zoned,
as @initMethod was doing)

[Siggi Cherem (dart-lang), 2014/05/23 17:56:33]

Done.

   useHtmlConfiguration();
 
   setUp(() => Polymer.onReady);