Merge net/cert/x509_certificate_bytes.cc into x509_certificate.cc

Bug: 769549
Cq-Include-Trybots: master.tryserver.chromium.android:android_cronet_tester;master.tryserver.chromium.mac:ios-simulator-cronet
Change-Id: If025a1309f3c4c14ce5f54f5454f8e1307220bd2
Reviewed-on: https://chromium-review.googlesource.com/745222Reviewed-by: Eric Roman <eroman@chromium.org>
Commit-Queue: Matt Mueller <mattm@chromium.org>
Cr-Commit-Position: refs/heads/master@{#512717}

net/BUILD.gn

@@ -253,7 +253,6 @@ component("net") {
     "cert/x509_cert_types.h",
     "cert/x509_certificate.cc",
     "cert/x509_certificate.h",
-    "cert/x509_certificate_bytes.cc",
     "cert/x509_certificate_net_log_param.cc",
     "cert/x509_certificate_net_log_param.h",
     "cert/x509_util.cc",