Change IllegalArgumentException to ArgumentError.

lib/html/templates/html/impl/impl_DocumentFragment.darttemplate

Index: lib/html/templates/html/impl/impl_DocumentFragment.darttemplate
diff --git a/lib/html/templates/html/impl/impl_DocumentFragment.darttemplate b/lib/html/templates/html/impl/impl_DocumentFragment.darttemplate
index 999ea00e20392a9f99dd69076ea471bd77a9d86a..96f0cda8d9d17f7cff9931f8d2f33af20109f7f5 100644
--- a/lib/html/templates/html/impl/impl_DocumentFragment.darttemplate
+++ b/lib/html/templates/html/impl/impl_DocumentFragment.darttemplate
@@ -38,7 +38,7 @@ class FilteredElementList implements ElementList {
     if (newLength >= len) {
       return;
     } else if (newLength < 0) {
-      throw const IllegalArgumentException("Invalid list length");
+      throw const ArgumentError("Invalid list length");
     }
 
     removeRange(newLength - 1, len - newLength);
@@ -190,7 +190,7 @@ class $CLASSNAME$EXTENDS$IMPLEMENTS$NATIVESPEC {
         this.nodes.add(node);
         return node;
       default:
-        throw new IllegalArgumentException("Invalid position ${where}");
+        throw new ArgumentError("Invalid position ${where}");
     }
   }