Revert "Fix handling of cross-origin windows in dartium and better align general handling of differ…

tools/dom/templates/html/dartium/html_dartium.darttemplate

Index: tools/dom/templates/html/dartium/html_dartium.darttemplate
diff --git a/tools/dom/templates/html/dartium/html_dartium.darttemplate b/tools/dom/templates/html/dartium/html_dartium.darttemplate
index e8a6a3183392aedb5df00113d505baf31cea0b25..c92c27e268ce93dc26a95e66d73c3324cd7cf9bf 100644
--- a/tools/dom/templates/html/dartium/html_dartium.darttemplate
+++ b/tools/dom/templates/html/dartium/html_dartium.darttemplate
@@ -256,40 +256,7 @@ Type _getSvgType(String key) {
   return null;
 }
 
-// TODO(jacobr): it would be nice to place these conversion methods in a consistent place for dart2js and dartium.
-
-WindowBase _convertNativeToDart_Window(win) {
-  if (win == null) return null;
-  return _DOMWindowCrossFrame._createSafe(win);
-}
-
-EventTarget _convertNativeToDart_EventTarget(e) {
-  if (e == null) {
-    return null;
-  }
-  // Assume it's a Window if it contains the postMessage property.  It may be
-  // from a different frame - without a patched prototype - so we cannot
-  // rely on Dart type checking.
-  try {
-    if (js.JsNative.hasProperty(e, "postMessage")) {
-      var window = _DOMWindowCrossFrame._createSafe(e);
-      // If it's a native window.
-      if (window is EventTarget) {
-        return window;
-      }
-      return null;
-    }
-  } catch (err) {
-    print("Error calling _convertNativeToDart_EventTarget... $err");
-  }
-  return e;
-}
-
-EventTarget _convertDartToNative_EventTarget(e) {
-  // _DOMWindowCrossFrame uses an interceptor so we don't need to do anything unlike Dart2Js.
-  return e;
-}
-
+// TODO(jacobr): it would be nice to place this in a consistent place for dart2js and dartium.
 _convertNativeToDart_XHR_Response(o) {
   if (o is Document) {
     return o;
@@ -354,6 +321,10 @@ debug_or_assert(message, expression) {
   }
 }
 
+// TODO(jacobr): we shouldn't be generating this call in the dart:html
+// bindings but we are.
+_convertDartToNative_EventTarget(target) => target;
+
 @Deprecated("Internal Use Only")
 Map<String, dynamic> convertNativeObjectToDartMap(js.JsObject jsObject) {
   var result = new Map();