message: Remove now redundant `static_cast`s
  All `StatusIs` matcher usages in Tink have been migrated to `absl::StatusCode`.
  Hopefully no user depends on this; if so we recommend users to migrate by replacing the call to "StatusIs" with the Tink error code with the corresponding absl::StatusCode.
  #tinkApiChange
diff: @@ -133,26 +133,20 @@ IsOkAndHolds(InnerMatcher&& inner_matcher) {
  std::forward<InnerMatcher>(inner_matcher));
  }
  -// Matches a Status with the specified 'code' as error_code().
  -// TODO(lizatretyakova): remove the static_cast and fix the comment above to
  -// use code() after all StatusIs usages are migrated to use absl::StatusCode.
  +// Matches a Status with the specified 'code' as code().
  MATCHER_P(StatusIs, code,
  - "is a Status with a " +
  - absl::StatusCodeToString(static_cast<absl::StatusCode>(code)) +
  - " code") {
  - if (arg.code() == static_cast<absl::StatusCode>(code)) {
  + "is a Status with a " + absl::StatusCodeToString(code) + " code") {
  + if (arg.code() == code) {
  return true;
  }
  *result_listener << ::testing::PrintToString(arg);
  return false;
  }
  -// Matches a Status whose error_code() equals 'code', and whose
  -// error_message() matches 'message_macher'.
  -// TODO(lizatretyakova): remove the static_cast and fix the comment above to
  -// use code() after all StatusIs usages are migrated to use absl::StatusCode.
  +// Matches a Status whose code() equals 'code', and whose message() matches
  +// 'message_macher'.
  MATCHER_P2(StatusIs, code, message_matcher, "") {
  - return (arg.code() == static_cast<absl::StatusCode>(code)) &&
  + return (arg.code() == code) &&
  testing::Matches(message_matcher)(std::string(arg.message()));
  }
  