Teach PasswordAutofillAgent sometimes match prefixes of usernames

components/password_manager/core/browser/password_autofill_manager.cc

Index: components/password_manager/core/browser/password_autofill_manager.cc
diff --git a/components/password_manager/core/browser/password_autofill_manager.cc b/components/password_manager/core/browser/password_autofill_manager.cc
index a242d655fc00f162453e80ea8e06b3c6e96e8b5f..19b6f27cfb233f598bbf10fbf959228b5cc28674 100644
--- a/components/password_manager/core/browser/password_autofill_manager.cc
+++ b/components/password_manager/core/browser/password_autofill_manager.cc
@@ -79,8 +79,8 @@ void AppendSuggestionIfMatching(
       show_all || base::StartsWith(lower_suggestion, lower_contents,
                                    base::CompareCase::SENSITIVE);
   if (prefix_matched_suggestion ||
-      autofill::FieldIsSuggestionSubstringStartingOnTokenBoundary(
-          lower_suggestion, lower_contents, true)) {
+      autofill::IsSubstringStartingOnTokenBoundary(lower_suggestion,
+                                                   lower_contents, true)) {
     autofill::Suggestion suggestion(ReplaceEmptyUsername(field_suggestion));
     suggestion.label = GetHumanReadableRealm(signon_realm);
     suggestion.frontend_id = is_password_field