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 e6f45b7831264a8053e8ec1ad3364eba7ebdb5af..fb17a8236b8faf6aa775d4db336f7b5cebe70877 100644
--- a/sdk/lib/html/templates/html/impl/impl_Element.darttemplate
+++ b/sdk/lib/html/templates/html/impl/impl_Element.darttemplate
@@ -484,8 +484,8 @@ $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) {
@@ -496,8 +496,8 @@ $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) {
@@ -509,8 +509,8 @@ $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()) {