Add @JSName annotation for native fields and methods.

sdk/lib/html/templates/html/impl/impl_Element.darttemplate

Index: sdk/lib/html/templates/html/impl/impl_Element.darttemplate
diff --git a/sdk/lib/html/templates/html/impl/impl_Element.darttemplate b/sdk/lib/html/templates/html/impl/impl_Element.darttemplate
index be0bbc83e486eaa3e6dd279c9e1a9c4459ebea1c..dd74435838e40bac013c6c25d85f356567fcdc06 100644
--- a/sdk/lib/html/templates/html/impl/impl_Element.darttemplate
+++ b/sdk/lib/html/templates/html/impl/impl_Element.darttemplate
@@ -494,8 +494,8 @@ $if DART2JS
     }
   }
 
-  void _insertAdjacentText(String where, String text)
-      native 'insertAdjacentText';
+  @JSName('insertAdjacentText')
+  void _insertAdjacentText(String where, String text) native;
 
   /** @domName Element.insertAdjacentHTML */
   void insertAdjacentHTML(String where, String text) {
@@ -506,8 +506,8 @@ $if DART2JS
     }
   }
 
-  void _insertAdjacentHTML(String where, String text)
-      native 'insertAdjacentHTML';
+  @JSName('insertAdjacentHTML')
+  void _insertAdjacentHTML(String where, String text) native;
 
   /** @domName Element.insertAdjacentHTML */
   Element insertAdjacentElement(String where, Element element) {
@@ -519,8 +519,8 @@ $if DART2JS
     return element;
   }
 
-  void _insertAdjacentElement(String where, Element element)
-      native 'insertAdjacentElement';
+  @JSName('insertAdjacentElement')
+  void _insertAdjacentElement(String where, Element element) native;
 
   void _insertAdjacentNode(String where, Node node) {
     switch (where.toLowerCase()) {