Revert "First rev of Safe DOM"

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

Index: tools/dom/templates/html/impl/impl_DocumentFragment.darttemplate
diff --git a/tools/dom/templates/html/impl/impl_DocumentFragment.darttemplate b/tools/dom/templates/html/impl/impl_DocumentFragment.darttemplate
index 199b67ad3359fa261cf7b67adefafd2784230ccd..8cbbf2c27ef301b3b2b1ec25d28b9fe305686a3d 100644
--- a/tools/dom/templates/html/impl/impl_DocumentFragment.darttemplate
+++ b/tools/dom/templates/html/impl/impl_DocumentFragment.darttemplate
@@ -7,18 +7,21 @@ part of $LIBRARYNAME;
 $(ANNOTATIONS)$(CLASS_MODIFIERS)class $CLASSNAME$EXTENDS$IMPLEMENTS$NATIVESPEC {
   factory $CLASSNAME() => document.createDocumentFragment();
 
-  factory $CLASSNAME.html(String html,
-      {NodeValidator validator, NodeTreeSanitizer treeSanitizer}) {
-
-    return document.body.createFragment(html,
-      validator: validator, treeSanitizer: treeSanitizer);
+  factory $CLASSNAME.html(String html) {
+    final fragment = new DocumentFragment();
+    fragment.innerHtml = html;
+    return fragment;
   }
 
-  factory $CLASSNAME.svg(String svgContent,
-      {NodeValidator validator, NodeTreeSanitizer treeSanitizer}) {
+  factory $CLASSNAME.svg(String svgContent) {
+    final fragment = new DocumentFragment();
+    final e = new svg.SvgSvgElement();
+    e.innerHtml = svgContent;
 
-    return new svg.SvgSvgElement().createFragment(svgContent,
-        validator: validator, treeSanitizer: treeSanitizer);
+    // Copy list first since we don't want liveness during iteration.
+    final List nodes = new List.from(e.nodes);
+    fragment.nodes.addAll(nodes);
+    return fragment;
   }
 
 $if DART2JS
@@ -54,16 +57,17 @@ $endif
     return e.innerHtml;
   }
 
+  // TODO(nweiz): Do we want to support some variant of innerHtml for XML and/or
+  // SVG strings?
   void set innerHtml(String value) {
-    this.setInnerHtml(value);
-  }
+    this.nodes.clear();
 
-  void setInnerHtml(String html,
-    {NodeValidator validator, NodeTreeSanitizer treeSanitizer}) {
+    final e = new Element.tag("div");
+    e.innerHtml = value;
 
-    this.nodes.clear();
-    append(document.body.createFragment(
-        html, validator: validator, treeSanitizer: treeSanitizer));
+    // Copy list first since we don't want liveness during iteration.
+    List nodes = new List.from(e.nodes, growable: false);
+    this.nodes.addAll(nodes);
   }
 
   /**