Revert "Dartium JS Interop enabled."

tools/dom/templates/html/impl/impl_Document.darttemplate

Index: tools/dom/templates/html/impl/impl_Document.darttemplate
diff --git a/tools/dom/templates/html/impl/impl_Document.darttemplate b/tools/dom/templates/html/impl/impl_Document.darttemplate
index ea3d901ead81f51ff56c446b24a75b4f275b750a..a9b19cf4467bf05c724769ca39c45bd358c9411f 100644
--- a/tools/dom/templates/html/impl/impl_Document.darttemplate
+++ b/tools/dom/templates/html/impl/impl_Document.darttemplate
@@ -26,7 +26,11 @@ $!MEMBERS
    * [CSS selector specification](http://www.w3.org/TR/css3-selectors/).
    */
   ElementList<Element> querySelectorAll(String selectors) {
+$if JSINTEROP
+    return _querySelectorAll(selectors);
+$else
     return new _FrozenElementList._wrap(_querySelectorAll(selectors));
+$endif
   }
 
   /**
@@ -66,49 +70,16 @@ $endif
 $if DART2JS
     return _createElement(tagName, typeExtension);
 $else
-    var newElement = (typeExtension == null) ?
-      _blink.BlinkDocument.instance.createElement_Callback_1_(unwrap_jso(this), tagName) :
-      _blink.BlinkDocument.instance.createElement_Callback_2_(unwrap_jso(this), tagName, typeExtension);
-
-    var wrapped;
-
-    if (newElement['dart_class'] != null) {
-      wrapped = newElement['dart_class'];         // Here's our Dart class.
-      wrapped.blink_jsObject = newElement;
-    } else {
-      wrapped = wrap_jso(newElement);
-      if (wrapped == null) {
-        wrapped = wrap_jso_custom_element(newElement);
-      }
-    }
-
-    return wrapped;
-$endif
-  }
-
-  @DomName('Document.createElementNS')
-  @DocsEditable()
-  Element createElementNS(String namespaceURI, String qualifiedName, [String typeExtension]) {
-$if DART2JS
-    return _createElementNS(tagName, qualifiedName, typeExtension);
-$else
-    var newElement = (typeExtension == null) ?
-      _blink.BlinkDocument.instance.createElementNS_Callback_2_(unwrap_jso(this), namespaceURI, qualifiedName) :
-      _blink.BlinkDocument.instance.createElementNS_Callback_3_(unwrap_jso(this), namespaceURI, qualifiedName, typeExtension);
-  
-    var wrapped;
-  
-    if (newElement['dart_class'] != null) {
-      wrapped = newElement['dart_class'];         // Here's our Dart class.
-      wrapped.blink_jsObject = newElement;
-    } else {
-      wrapped = wrap_jso(newElement);
-      if (wrapped == null) {
-        wrapped = wrap_jso_custom_element(newElement);
-      }
-    }
-  
-    return wrapped;
+  $if JSINTEROP
+    return _createElement(tagName, typeExtension);
+  $else
+    if (typeExtension != null) {  
+      return _createElement(tagName, typeExtension);  
+    } else {  
+      // Fast-path for Dartium when typeExtension is not needed.  
+      return _Utils.createElement(this, tagName); 
+    } 
+  $endif
 $endif
   }