Add GetMimeTypeFromFile to Mojo's network service.

mojo/shell/application_manager.cc

 // Copyright 2014 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 "mojo/shell/application_manager.h"
 
 #include "base/bind.h"
 #include "base/command_line.h"
 #include "base/logging.h"
 #include "base/macros.h"
@@ skipping 116 matching lines @@
       base::Passed(services.Pass()), base::Passed(exposed_services.Pass()),
       filter, on_application_end);
 
   if (delegate_->CreateFetcher(
           resolved_url,
           base::Bind(callback, NativeApplicationCleanup::DONT_DELETE))) {
     return;
   }
 
   if (resolved_url.SchemeIsFile()) {
+    // LocalFetcher uses the network service to infer MIME types from URLs.
+    // Skip this for mojo URLs to avoid recursively loading the network service.
+    if (!network_service_ && !requested_gurl.SchemeIs("mojo"))
+      ConnectToService(GURL("mojo:network_service"), &network_service_);
     new LocalFetcher(
-        resolved_url, GetBaseURLAndQuery(resolved_url, nullptr),
+        network_service_.get(), resolved_url,
+        GetBaseURLAndQuery(resolved_url, nullptr),
         base::Bind(callback, NativeApplicationCleanup::DONT_DELETE));
     return;
   }
 
   if (mapped_url.SchemeIs("mojo") &&
       base::CommandLine::ForCurrentProcess()->HasSwitch(
           switches::kUseUpdater)) {
     ConnectToService(GURL("mojo:updater"), &updater_);
     new UpdateFetcher(
         mapped_url, updater_.get(),
@@ skipping 387 matching lines @@
   ConnectToApplication(nullptr, request.Pass(), std::string(), GURL(),
                        GetProxy(&services), nullptr,
                        GetPermissiveCapabilityFilter(), base::Closure());
   MessagePipe pipe;
   services->ConnectToService(interface_name, pipe.handle1.Pass());
   return pipe.handle0.Pass();
 }
 
 }  // namespace shell
 }  // namespace mojo