arc: Move platform2/arc/network/ to platform2/patchpanel

Next step in the arc-networkd -> patchpanel rename, this patch moves the
location of the code.

BUG=b:151879931
TEST=units,flashed image to atlas
TEST=tasts arc.PlayStore, crostini.LaunchTerminal.download

Change-Id: I1b5cf8d670e1631d46f6449b725395157bf88dde
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform2/+/2115863
Tested-by: Garrick Evans <garrick@chromium.org>
Commit-Queue: Garrick Evans <garrick@chromium.org>
Reviewed-by: Hidehiko Abe <hidehiko@chromium.org>
Reviewed-by: Eric Caruso <ejcaruso@chromium.org>
Reviewed-by: Chirantan Ekbote <chirantan@chromium.org>
Reviewed-by: Hugo Benichi <hugobenichi@google.com>
diff --git a/system-proxy/server_proxy.h b/system-proxy/server_proxy.h
index f5bc346..57da525 100644
--- a/system-proxy/server_proxy.h
+++ b/system-proxy/server_proxy.h
@@ -17,10 +17,10 @@
 #include <brillo/asynchronous_signal_handler.h>
 #include <gtest/gtest_prod.h>  // for FRIEND_TEST
 
-namespace arc_networkd {
+namespace patchpanel {
 class Socket;
 class SocketForwarder;
-}  // namespace arc_networkd
+}  // namespace patchpanel
 
 namespace system_proxy {
 
@@ -73,7 +73,7 @@
   // corresponds to the tunnel between the client and the server that has
   // started to forward data. In case of failure, |fwd| is empty.
   void OnConnectionSetupFinished(
-      std::unique_ptr<arc_networkd::SocketForwarder> fwd,
+      std::unique_ptr<patchpanel::SocketForwarder> fwd,
       ProxyConnectJob* connect_job);
 
   // Called when the proxy resolution result for |target_url| is received via
@@ -91,13 +91,13 @@
   // encoded and separated by colon.
   std::string credentials_;
 
-  std::unique_ptr<arc_networkd::Socket> listening_fd_;
+  std::unique_ptr<patchpanel::Socket> listening_fd_;
 
   // List of SocketForwarders that corresponds to the TCP tunnel between the
   // local client and the remote  proxy, forwarding data between the TCP
   // connection initiated by the local client to the local proxy and the TCP
   // connection initiated by the local proxy to the remote proxy.
-  std::list<std::unique_ptr<arc_networkd::SocketForwarder>> forwarders_;
+  std::list<std::unique_ptr<patchpanel::SocketForwarder>> forwarders_;
 
   std::map<ProxyConnectJob*, std::unique_ptr<ProxyConnectJob>>
       pending_connect_jobs_;