Compatible handling of the form.autocomplete IDL attribute.

LayoutTests/fast/forms/autocomplete-expected.txt

Index: LayoutTests/fast/forms/autocomplete-expected.txt
diff --git a/LayoutTests/fast/forms/autocomplete-expected.txt b/LayoutTests/fast/forms/autocomplete-expected.txt
index d16a92c8f7e50338315d67ac6dda976b7bdb5ddb..c6905aafa779c4d3288b385e60dcbcc1d5bf96e0 100644
--- a/LayoutTests/fast/forms/autocomplete-expected.txt
+++ b/LayoutTests/fast/forms/autocomplete-expected.txt
@@ -1,16 +1,18 @@
 This tests that the 'autocomplete' attribute of form and input elements is bound to a JavaScript property.
 
-PASS successfullyParsed is true
-
-TEST COMPLETE
 PASS ('autocomplete' in form) is true
 PASS ('autocomplete' in field) is true
 PASS form.getAttribute('autocomplete') is null
 PASS field.getAttribute('autocomplete') is null
-PASS form.autocomplete is ""
-PASS field.autocomplete is ""
-PASS form.getAttribute('autocomplete') is "off"
-PASS field.getAttribute('autocomplete') is "off"
 PASS form.autocomplete is "on"
-PASS field.autocomplete is "on"
+PASS field.autocomplete is ""
+PASS form.autocomplete = 'off'; form.getAttribute('autocomplete') is "off"
+PASS field.autocomplete = 'off'; field.getAttribute('autocomplete') is "off"
+PASS form.setAttribute('autocomplete', 'on'); form.autocomplete is "on"
+PASS field.setAttribute('autocomplete', 'on'); field.autocomplete is "on"
+PASS form.setAttribute('autocomplete', 'indeterminate'); form.autocomplete is "on"
+PASS field.setAttribute('autocomplete', 'indeterminate'); field.autocomplete is "indeterminate"
+PASS successfullyParsed is true
+
+TEST COMPLETE