Tweak Document.createElement for better inlining

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 20608131f28dd55b9a744d431ceac5d4465cf9f2..8b9d22bc5f1f95f714936ff587cc31cd31dc7bc9 100644
--- a/tools/dom/templates/html/impl/impl_Document.darttemplate
+++ b/tools/dom/templates/html/impl/impl_Document.darttemplate
@@ -64,11 +64,9 @@ $endif
   @DomName('Document.createElement')
   Element createElement(String tagName, [String typeExtension]) {
 $if DART2JS
-    if (typeExtension == null) {
-      return _createElement_2(tagName);
-    } else {
-      return _createElement(tagName, typeExtension);
-    }
+    return (typeExtension == null)
+        ? _createElement_2(tagName)
+        : _createElement(tagName, typeExtension);
 $else
     var newElement = (typeExtension == null) ?
       _blink.BlinkDocument.instance.createElement_Callback_1_(unwrap_jso(this), tagName) :
@@ -107,11 +105,9 @@ $endif
   @DocsEditable()
   Element createElementNS(String namespaceURI, String qualifiedName, [String typeExtension]) {
 $if DART2JS
-    if (typeExtension == null) {
-      return _createElementNS_2(namespaceURI, qualifiedName);
-    } else {
-      return _createElementNS(namespaceURI, qualifiedName, typeExtension);
-    }
+    return (typeExtension == null)
+        ? _createElementNS_2(namespaceURI, qualifiedName)
+        : _createElementNS(namespaceURI, qualifiedName, typeExtension);
 $else
     var newElement = (typeExtension == null) ?
       _blink.BlinkDocument.instance.createElementNS_Callback_2_(unwrap_jso(this), namespaceURI, qualifiedName) :