Exclude readonly and disabled elements from autofill form.

components/autofill/content/renderer/form_autofill_util.cc

Index: components/autofill/content/renderer/form_autofill_util.cc
diff --git a/components/autofill/content/renderer/form_autofill_util.cc b/components/autofill/content/renderer/form_autofill_util.cc
index 10d6cca9160885f95957ec482b9403489fa5999b..6b98dee792515cebc89f0c3e01be67ff9ac80b6b 100644
--- a/components/autofill/content/renderer/form_autofill_util.cc
+++ b/components/autofill/content/renderer/form_autofill_util.cc
@@ -74,6 +74,10 @@ bool HasTagName(const WebNode& node, const blink::WebString& tag) {
 }
 
 bool IsAutofillableElement(const WebFormControlElement& element) {
+  // Exclude disabled and readonly elements.
+  if (!element.isEnabled() || element.isReadOnly())
+    return false;
+
   const WebInputElement* input_element = toWebInputElement(&element);
   return IsAutofillableInputElement(input_element) ||
          IsSelectElement(element) ||