Tweak Document.createElement for better inlining

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

 // Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 part of $LIBRARYNAME;
 
 @DocsEditable()
 $(ANNOTATIONS)$(NATIVESPEC)$(CLASS_MODIFIERS)class $CLASSNAME extends Node
 {
 
@@ skipping 46 matching lines @@
 $endif
   }
 
   /// *Deprecated*: use [supportsRegisterElement] instead.
   @deprecated
   bool get supportsRegister => supportsRegisterElement;
 
   @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) :
       _blink.BlinkDocument.instance.createElement_Callback_2_(unwrap_jso(this), tagName, typeExtension);
 
     var wrapped = js.getDartHtmlWrapperFor(newElement);  // Here's our Dart class.
     if (wrapped != null) {
       wrapped.blink_jsObject = newElement;
     } else {
       wrapped = wrap_jso(newElement);
@@ skipping 18 matching lines @@
   // omit the typeExtension if it's null on Firefox or we get an is="null" attribute.
   @DomName('Document.createElementNS')
   _createElementNS_2(String namespaceURI, String qualifiedName) =>
       JS('', '#.createElementNS(#, #)', this, namespaceURI, qualifiedName);
 
 $endif
   @DomName('Document.createElementNS')
   @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) :
       _blink.BlinkDocument.instance.createElementNS_Callback_3_(unwrap_jso(this), namespaceURI, qualifiedName, typeExtension);
 
     var wrapped;
 
     wrapped = js.getDartHtmlWrapperFor(newElement);  // Here's our Dart class.
     if (wrapped != null) {
       wrapped.blink_jsObject = newElement;
@@ skipping 17 matching lines @@
       => JS('NodeIterator', '#.createNodeIterator(#, #, #, false)',
           this, root, whatToShow, filter);
 
   @DomName('Document.createTreeWalker')
   TreeWalker _createTreeWalker(Node root,
       [int whatToShow, NodeFilter filter])
       => JS('TreeWalker', '#.createTreeWalker(#, #, #, false)',
           this, root, whatToShow, filter);
 $endif
 }