Disable native messaging in non-supported configurations

chrome/browser/extensions/api/messaging/message_service.cc

Index: chrome/browser/extensions/api/messaging/message_service.cc
diff --git a/chrome/browser/extensions/api/messaging/message_service.cc b/chrome/browser/extensions/api/messaging/message_service.cc
index 5592fad351da08eb25018cf27ed8d1bbc8fd7fa1..74873162e8c1660745020f27d8eade1d0c3c6fe7 100644
--- a/chrome/browser/extensions/api/messaging/message_service.cc
+++ b/chrome/browser/extensions/api/messaging/message_service.cc
@@ -188,6 +188,7 @@ void MessageService::OpenChannelToNativeApp(
     int receiver_port_id,
     const std::string& source_extension_id,
     const std::string& native_app_name) {
+#if defined(OS_WIN) || defined(OS_MAXOSX) || defined(OS_LINUX)
   content::RenderProcessHost* source =
       content::RenderProcessHost::FromID(source_process_id);
   if (!source)
@@ -217,6 +218,9 @@ void MessageService::OpenChannelToNativeApp(
   // Abandon the channel
   if (!native_process.get()) {
     LOG(ERROR) << "Failed to create native process.";
+    // Treat it as a disconnect.
+    ExtensionMessagePort port(source, MSG_ROUTING_CONTROL, "");
+    port.DispatchOnDisconnect(GET_OPPOSITE_PORT_ID(receiver_port_id), true);
     return;
   }
   channel->receiver.reset(new NativeMessagePort(native_process.release()));
@@ -225,6 +229,10 @@ void MessageService::OpenChannelToNativeApp(
   channel->opener->IncrementLazyKeepaliveCount();
 
   AddChannel(channel.release(), receiver_port_id);
+#else  // defined(OS_WIN) || defined(OS_MAXOSX) || defined(OS_LINUX)
+  ExtensionMessagePort port(source, MSG_ROUTING_CONTROL, "");
+  port.DispatchOnDisconnect(GET_OPPOSITE_PORT_ID(receiver_port_id), true);
+#endif  // !(defined(OS_WIN) || defined(OS_MAXOSX) || defined(OS_LINUX))

[Matt Perry, 2013/02/11 22:44:54]

nit: These comments seem backwards to me. The endif comment is actually matches
the else branch's condition. If anything should be labeled with the else
branch's condition, it should be the else branch itself.

[Sergey Ulanov, 2013/02/13 01:15:25]

Done.

 }
 
 void MessageService::OpenChannelToTab(