[dart:html] rename custom elements callbacks to match spec

tools/dom/src/dart2js_CustomElementSupport.dart

Index: tools/dom/src/dart2js_CustomElementSupport.dart
diff --git a/tools/dom/src/dart2js_CustomElementSupport.dart b/tools/dom/src/dart2js_CustomElementSupport.dart
index 009f85767202a6d77e6f0b9f56a796483fecd84f..62c120d0ba1af72440d214be874a9027e61a1f24 100644
--- a/tools/dom/src/dart2js_CustomElementSupport.dart
+++ b/tools/dom/src/dart2js_CustomElementSupport.dart
@@ -16,12 +16,12 @@ _callConstructor(constructor, interceptor) {
   };
 }
 
-_callEnteredView(receiver) {
-  return receiver.enteredView();
+_callAttached(receiver) {
+  return receiver.attached();
 }
 
-_callLeftView(receiver) {
-  return receiver.leftView();
+_callDetached(receiver) {
+  return receiver.detached();
 }
  _callAttributeChanged(receiver, name, oldValue, newValue) {
   return receiver.attributeChanged(name, oldValue, newValue);
@@ -104,9 +104,9 @@ void _registerCustomElement(context, document, String tag, Type type,
       JS('=Object', '{value: #}',
           _makeCallbackMethod(_callConstructor(constructor, interceptor))));
   JS('void', '#.attachedCallback = #', properties,
-      JS('=Object', '{value: #}', _makeCallbackMethod(_callEnteredView)));
+      JS('=Object', '{value: #}', _makeCallbackMethod(_callAttached)));
   JS('void', '#.detachedCallback = #', properties,
-      JS('=Object', '{value: #}', _makeCallbackMethod(_callLeftView)));
+      JS('=Object', '{value: #}', _makeCallbackMethod(_callDetached)));
   JS('void', '#.attributeChangedCallback = #', properties,
       JS('=Object', '{value: #}', _makeCallbackMethod3(_callAttributeChanged)));