message: tls: use absl::string_view when calling absl::StrReplaceAll().
  This change is triggered by Google import, which uses different string type,
  and not by any performance issues with existing code.
diff: @@ -249,11 +249,9 @@ const std::string& SslSocket::urlEncodedPemEncodedPeerCertificate() const {
  const uint8_t* output;
  size_t length;
  RELEASE_ASSERT(BIO_mem_contents(buf.get(), &output, &length) == 1);
  - cached_url_encoded_pem_encoded_peer_certificate_ =
  - std::string(reinterpret_cast<const char*>(output), length);
  - // URL encoding shortcut
  - absl::StrReplaceAll({{"\n", "%0A"}, {" ", "%20"}, {"+", "%2B"}, {"/", "%2F"}, {"=", "%3D"}},
  - &cached_url_encoded_pem_encoded_peer_certificate_);
  + absl::string_view pem(reinterpret_cast<const char*>(output), length);
  + cached_url_encoded_pem_encoded_peer_certificate_ = absl::StrReplaceAll(
  + pem, {{"\n", "%0A"}, {" ", "%20"}, {"+", "%2B"}, {"/", "%2F"}, {"=", "%3D"}});
  return cached_url_encoded_pem_encoded_peer_certificate_;
  }
  