Add missing header files to GN files (3 of N)

net/BUILD.gn

Index: net/BUILD.gn
diff --git a/net/BUILD.gn b/net/BUILD.gn
index 084f66a1e271e08e40bfcf06f4aae60e353508f2..0a932af1c4d277df68ec21cf76fbe8a90712c9d8 100644
--- a/net/BUILD.gn
+++ b/net/BUILD.gn
@@ -460,6 +460,7 @@ component("net") {
       "base/network_interfaces_linux.cc",
       "base/network_interfaces_linux.h",
       "base/network_interfaces_mac.cc",
+      "base/network_interfaces_mac.h",
       "base/network_interfaces_win.cc",
       "base/network_interfaces_win.h",
       "base/network_throttle_manager.h",
@@ -1831,12 +1832,15 @@ component("net") {
         "base/mac/url_conversions.h",
         "base/mac/url_conversions.mm",
         "base/network_change_notifier_mac.cc",
+        "base/network_change_notifier_mac.h",
         "base/network_config_watcher_mac.cc",
+        "base/network_config_watcher_mac.h",
         "base/network_interfaces_mac.cc",
         "base/network_interfaces_mac.h",
         "base/platform_mime_util_mac.mm",
         "cert/test_root_certs_mac.cc",
         "proxy/proxy_resolver_mac.cc",
+        "proxy/proxy_resolver_mac.h",
         "proxy/proxy_server_mac.cc",
       ]