Make getKeys, getValues getters (keys, values).

lib/html/templates/html/impl/impl_Storage.darttemplate

Index: lib/html/templates/html/impl/impl_Storage.darttemplate
diff --git a/lib/html/templates/html/impl/impl_Storage.darttemplate b/lib/html/templates/html/impl/impl_Storage.darttemplate
index 67f370bc7bd329349aee60b4a9a0698e4fa09282..38c83f2bbb4b9c87bd93d21d0228078ed9a39434 100644
--- a/lib/html/templates/html/impl/impl_Storage.darttemplate
+++ b/lib/html/templates/html/impl/impl_Storage.darttemplate
@@ -5,7 +5,7 @@
 class $CLASSNAME$EXTENDS$IMPLEMENTS$NATIVESPEC {
 
   // TODO(nweiz): update this when maps support lazy iteration
-  bool containsValue(String value) => getValues().some((e) => e == value);
+  bool containsValue(String value) => values.some((e) => e == value);
 
   bool containsKey(String key) => $dom_getItem(key) != null;
 
@@ -35,13 +35,13 @@ class $CLASSNAME$EXTENDS$IMPLEMENTS$NATIVESPEC {
     }
   }
 
-  Collection<String> getKeys() {
+  Collection<String> get keys {
     final keys = [];
     forEach((k, v) => keys.add(k));
     return keys;
   }
 
-  Collection<String> getValues() {
+  Collection<String> get values {
     final values = [];
     forEach((k, v) => values.add(v));
     return values;