Add a buffer reader/writer for NTLM.

net/BUILD.gn

Index: net/BUILD.gn
diff --git a/net/BUILD.gn b/net/BUILD.gn
index 69809871e7f67a15a5ee22bc500f6fbf6d4e836e..c18de29776f86a222ebb7a48f7bd2e6f8c0b422b 100644
--- a/net/BUILD.gn
+++ b/net/BUILD.gn
@@ -1763,6 +1763,10 @@ component("net") {
       }
     }
 
+    if (!is_win) {
+      deps += [ "//net/ntlm" ]
+    }
+
     if (!enable_built_in_dns) {
       sources -= [
         "dns/address_sorter_posix.cc",
@@ -5215,6 +5219,10 @@ test("net_unittests") {
     deps += [ "//gin" ]
   }
 
+  if (!is_win) {
+    deps += [ "//net/ntlm:ntlm_unittests" ]
+  }
+
   if (!use_nss_certs) {
     sources -= [
       "cert/internal/trust_store_nss_unittest.cc",