Revert "First rev of Safe DOM"

pkg/mdv/test/template_element_test.dart

Index: pkg/mdv/test/template_element_test.dart
diff --git a/pkg/mdv/test/template_element_test.dart b/pkg/mdv/test/template_element_test.dart
index a26d62b502441abef5f996615d15f685742e1486..e90cf9c55ea5d5ca6bff9741292b487bcb591b50 100644
--- a/pkg/mdv/test/template_element_test.dart
+++ b/pkg/mdv/test/template_element_test.dart
@@ -40,7 +40,7 @@ templateElementTests() {
 
   createTestHtml(s) {
     var div = new DivElement();
-    div.setInnerHtml(s, treeSanitizer: new NullTreeSanitizer());
+    div.innerHtml = s;
     testDiv.append(div);
 
     for (var node in div.queryAll('*')) {
@@ -1779,10 +1779,3 @@ _deepToSymbol(value) {
   }
   return value;
 }
-
-/**
- * Sanitizer which does nothing.
- */
-class NullTreeSanitizer implements NodeTreeSanitizer {
-  void sanitizeTree(Node node) {}
-}