Remove unused functor LessThanUniqueKey.

Bug: 1007974
Change-Id: I26357ca5b4d6cde425b2bd16315e63d72db6d3c3
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1844972
Commit-Queue: Vadym Doroshenko <dvadym@chromium.org>
Reviewed-by: Vadym Doroshenko <dvadym@chromium.org>
Cr-Commit-Position: refs/heads/master@{#703272}

components/autofill/core/common/password_form.cc

@@ -213,28 +213,6 @@ bool ArePasswordFormUniqueKeysEqual(const PasswordForm& left,
           left.password_element == right.password_element);
 }
 
-bool LessThanUniqueKey::operator()(
-    const std::unique_ptr<PasswordForm>& left,
-    const std::unique_ptr<PasswordForm>& right) const {
-  int result = left->signon_realm.compare(right->signon_realm);
-  if (result)
-    return result < 0;
-
-  result = left->username_element.compare(right->username_element);
-  if (result)
-    return result < 0;
-
-  result = left->username_value.compare(right->username_value);
-  if (result)
-    return result < 0;
-
-  result = left->password_element.compare(right->password_element);
-  if (result)
-    return result < 0;
-
-  return left->origin < right->origin;
-}
-
 base::string16 ValueElementVectorToString(
     const ValueElementVector& value_element_pairs) {
   std::vector<base::string16> pairs(value_element_pairs.size());

components/autofill/core/common/password_form.h

@@ -360,12 +360,6 @@ struct PasswordForm {
 bool ArePasswordFormUniqueKeysEqual(const PasswordForm& left,
                                     const PasswordForm& right);
 
-// A comparator for the unique key.
-struct LessThanUniqueKey {
-  bool operator()(const std::unique_ptr<PasswordForm>& left,
-                  const std::unique_ptr<PasswordForm>& right) const;
-};
-
 // Converts a vector of ValueElementPair to string.
 base::string16 ValueElementVectorToString(
     const ValueElementVector& value_element_pairs);