Disable native messaging in non-supported configurations

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

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "chrome/browser/extensions/api/messaging/message_service.h"
 
 #include "base/atomic_sequence_num.h"
 #include "base/bind.h"
 #include "base/callback.h"
 #include "base/json/json_writer.h"
@@ skipping 175 matching lines @@
     int source_process_id,
     int source_routing_id,
     int receiver_port_id,
     const std::string& source_extension_id,
     const std::string& native_app_name) {
   content::RenderProcessHost* source =
       content::RenderProcessHost::FromID(source_process_id);
   if (!source)
     return;
 
+#if defined(OS_WIN) || defined(OS_MACOSX) || defined(OS_LINUX)
   WebContents* source_contents = tab_util::GetWebContentsByID(
       source_process_id, source_routing_id);
 
   // Include info about the opener's tab (if it was a tab).
   std::string tab_json = "null";
   if (source_contents) {
     scoped_ptr<DictionaryValue> tab_value(ExtensionTabUtil::CreateTabValue(
         source_contents));
     base::JSONWriter::Write(tab_value.get(), &tab_json);
   }
 
   scoped_ptr<MessageChannel> channel(new MessageChannel());
   channel->opener.reset(new ExtensionMessagePort(source, MSG_ROUTING_CONTROL,
                                                  source_extension_id));
 
   scoped_ptr<NativeMessageProcessHost> native_process =
       NativeMessageProcessHost::Create(
           base::WeakPtr<NativeMessageProcessHost::Client>(
               weak_factory_.GetWeakPtr()),
           native_app_name, receiver_port_id);
 
   // 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()));
 
   // Keep the opener alive until the channel is closed.
   channel->opener->IncrementLazyKeepaliveCount();
 
   AddChannel(channel.release(), receiver_port_id);
+#else  // !(defined(OS_WIN) || defined(OS_MACOSX) || 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_MACOSX) || defined(OS_LINUX))
 }
 
 void MessageService::OpenChannelToTab(
     int source_process_id, int source_routing_id, int receiver_port_id,
     int tab_id, const std::string& extension_id,
     const std::string& channel_name) {
   content::RenderProcessHost* source =
       content::RenderProcessHost::FromID(source_process_id);
   if (!source)
     return;
@@ skipping 237 matching lines @@
     return;
 
   params->source = source;
   params->receiver.reset(new ExtensionMessagePort(host->render_process_host(),
                                                   MSG_ROUTING_CONTROL,
                                                   params->target_extension_id));
   OpenChannelImpl(params.Pass());
 }
 
 }  // namespace extensions