Allow building mojo_shell and non-graphical apps/services on a Mac

shell/application_manager/network_fetcher.cc

 // Copyright 2015 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 "shell/application_manager/network_fetcher.h"
 
 #include "base/bind.h"
 #include "base/command_line.h"
 #include "base/files/file.h"
 #include "base/files/file_path.h"
@@ skipping 11 matching lines @@
 #include "mojo/data_pipe_utils/data_pipe_utils.h"
 #include "shell/application_manager/data_pipe_peek.h"
 
 namespace shell {
 
 namespace {
 #if defined(OS_LINUX)
 char kArchitecture[] = "linux-x64";
 #elif defined(OS_ANDROID)
 char kArchitecture[] = "android-arm";
+#elif defined(OS_MACOSX)
+char kArchitecture[] = "macosx";
 #else
 #error "Unsupported."
 #endif
 };
 
 NetworkFetcher::NetworkFetcher(
     bool disable_cache,
     const GURL& url,
     mojo::URLResponseDiskCache* url_response_disk_cache,
     mojo::NetworkService* network_service,
@@ skipping 143 matching lines @@
                << "while fetching " << response->url;
     loader_callback_.Run(nullptr);
     return;
   }
 
   response_ = response.Pass();
   loader_callback_.Run(owner.Pass());
 }
 
 }  // namespace shell