[Autofill] Update the autocomplete types implementation to match the current HTML spec.

chrome/renderer/autofill/autofill_renderer_browsertest.cc

Index: chrome/renderer/autofill/autofill_renderer_browsertest.cc
diff --git a/chrome/renderer/autofill/autofill_renderer_browsertest.cc b/chrome/renderer/autofill/autofill_renderer_browsertest.cc
index dd6171b751e10c21d09c0f7a5631d8c7c821a183..0abae22f56ce870f1353c20f85823e91b7b4636d 100644
--- a/chrome/renderer/autofill/autofill_renderer_browsertest.cc
+++ b/chrome/renderer/autofill/autofill_renderer_browsertest.cc
@@ -64,8 +64,10 @@ TEST_F(ChromeRenderViewTest, SendForms) {
   expected.name = ASCIIToUTF16("lastname");
   expected.value = string16();
   expected.form_control_type = ASCIIToUTF16("text");
+  expected.autocomplete_attribute = ASCIIToUTF16("off");
   expected.max_length = WebInputElement::defaultMaxLength();
   EXPECT_FORM_FIELD_DATA_EQUALS(expected, forms[0].fields[2]);
+  expected.autocomplete_attribute = string16();  // reset
 
   expected.name = ASCIIToUTF16("state");
   expected.value = ASCIIToUTF16("?");