Partially migrate from old getter syntax to new one.

lib/dom/templates/html/impl/impl_NodeList.darttemplate

Index: lib/dom/templates/html/impl/impl_NodeList.darttemplate
diff --git a/lib/dom/templates/html/impl/impl_NodeList.darttemplate b/lib/dom/templates/html/impl/impl_NodeList.darttemplate
index df60d5b20817414097be440e23cd5aef82ed56f2..6d67b1deecbcc88b2fe0b311440180602b700733 100644
--- a/lib/dom/templates/html/impl/impl_NodeList.darttemplate
+++ b/lib/dom/templates/html/impl/impl_NodeList.darttemplate
@@ -23,7 +23,7 @@ class _ListWrapper<E> implements List<E> {
 
   bool isEmpty() => _list.isEmpty();
 
-  int get length() => _list.length;
+  int get length => _list.length;
 
   E operator [](int index) => _list[index];
 
@@ -62,7 +62,7 @@ class _ListWrapper<E> implements List<E> {
   void insertRange(int start, int rangeLength, [E initialValue = null]) =>
     _list.insertRange(start, rangeLength, initialValue);
 
-  E get first() => _list[0];
+  E get first => _list[0];
 }
 
 /**
@@ -152,7 +152,7 @@ class $CLASSNAME$EXTENDS$IMPLEMENTS$NATIVESPEC {
       _Lists.lastIndexOf(this, element, start);
 
   Node last() => this[length - 1];
-  Node get first() => this[0];
+  Node get first => this[0];
 
   // FIXME: implement thesee.
   void setRange(int start, int rangeLength, List<Node> from, [int startFrom]) {