Move dom-serializer.sky to dom_serializer.dart (and clean up some analyizer errors)

sky/tests/TestExpectations

Index: sky/tests/TestExpectations
diff --git a/sky/tests/TestExpectations b/sky/tests/TestExpectations
index 9ba55d68ff956a5277d7aa1ccd7343399f5563c6..b13b16e89217f67173f932d417a9a98bf949e855 100644
--- a/sky/tests/TestExpectations
+++ b/sky/tests/TestExpectations
@@ -18,18 +18,6 @@ crbug.com/2 animation/basic-imperative.sky [ Skip ]
 crbug.com/2 animation/basic-transition.sky [ Skip ]
 crbug.com/2 events/gesture-events.sky [ Skip ]
 crbug.com/2 events/pointer-events.sky [ Skip ]
-crbug.com/2 framework/binding.sky [ Skip ]
-crbug.com/2 framework/citylist-scrolled.sky [ Skip ]
-crbug.com/2 framework/citylist.sky [ Skip ]
-crbug.com/2 framework/flights-app.sky [ Skip ]
-crbug.com/2 framework/observe.sky [ Skip ]
-crbug.com/2 framework/templates.sky [ Skip ]
-crbug.com/2 framework/xmlhttprequest/empty-responseType.sky [ Skip ]
-crbug.com/2 framework/xmlhttprequest/responseType.sky [ Skip ]
-crbug.com/2 framework/xmlhttprequest/unicode-post.sky [ Skip ]
-crbug.com/2 framework/xmlhttprequest/xhr-does-not-exist.sky [ Skip ]
-crbug.com/2 framework/xmlhttprequest/xhr-relative.sky [ Skip ]
-crbug.com/2 framework/xmlhttprequest/xhr.sky [ Skip ]
 crbug.com/2 layout/margins-absolute.sky [ Skip ]
 crbug.com/2 layout/margins.sky [ Skip ]
 crbug.com/2 lowlevel/createElement.sky [ Skip ]