Add X509CertificateBytes which uses CRYPTO_BUFFER instead of macOS-native certificate types.

net/BUILD.gn

Index: net/BUILD.gn
diff --git a/net/BUILD.gn b/net/BUILD.gn
index f8a9a4cdce9c110ea5d4972f4ebc9f15b11a46ac..ed45d9e75d7e73e3a13bea823643cdf0c7edb0b7 100644
--- a/net/BUILD.gn
+++ b/net/BUILD.gn
@@ -583,6 +583,7 @@ component("net") {
       "cert/test_root_certs_win.cc",
       "cert/x509_cert_types_mac.cc",
       "cert/x509_cert_types_win.cc",
+      "cert/x509_certificate_bytes.cc",
       "cert/x509_certificate_ios.cc",
       "cert/x509_certificate_known_roots_win.h",
       "cert/x509_certificate_mac.cc",
@@ -590,6 +591,8 @@ component("net") {
       "cert/x509_certificate_win.cc",
       "cert/x509_util_android.cc",
       "cert/x509_util_android.h",
+      "cert/x509_util_ios.cc",
+      "cert/x509_util_ios.h",
       "cert/x509_util_mac.cc",
       "cert/x509_util_mac.h",
       "cert/x509_util_nss.cc",
@@ -1705,6 +1708,26 @@ component("net") {
       ]
     }
 
+    if (use_byte_certs) {
+      if (is_ios) {
+        sources -= [ "cert/x509_certificate_ios.cc" ]
+      }
+      if (is_mac) {
+        sources -= [ "cert/x509_certificate_mac.cc" ]
+      }
+      if (use_nss_certs) {
+        sources -= [ "cert/x509_certificate_nss.cc" ]
+      }
+      if (use_openssl_certs) {
+        sources -= [ "cert/x509_certificate_openssl.cc" ]
+      }
+      if (is_win) {
+        sources -= [ "cert/x509_certificate_win.cc" ]
+      }
+    } else {
+      sources -= [ "cert/x509_certificate_bytes.cc" ]
+    }
+
     if (!use_openssl_certs) {
       sources -= [
         "cert/cert_database_openssl.cc",