[Autofill] Pass struct by const-reference.

components/autofill/browser/form_structure.cc

Index: components/autofill/browser/form_structure.cc
diff --git a/components/autofill/browser/form_structure.cc b/components/autofill/browser/form_structure.cc
index 02a581fb8e709307fd7e389e4c49665badafc0ab..63ebca0ac6f3ec5446d91eaa6cab0293b5fddc7a 100644
--- a/components/autofill/browser/form_structure.cc
+++ b/components/autofill/browser/form_structure.cc
@@ -658,7 +658,7 @@ bool FormStructure::IsAutocheckoutEnabled() const {
   return !autocheckout_url_prefix_.empty();
 }
 
-bool FormStructure::ShouldSkipField(const FormFieldData field) const {
+bool FormStructure::ShouldSkipField(const FormFieldData& field) const {
   return (field.is_checkable || field.form_control_type == "password") &&
       !IsAutocheckoutEnabled();
 }