Fix network service hanging with empty bodies.

content/public/test/browser_test_base.cc

 // Copyright (c) 2011 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 "content/public/test/browser_test_base.h"
 
 #include <stddef.h>
 
 #include "base/bind.h"
 #include "base/command_line.h"
@@ skipping 16 matching lines @@
 #include "content/public/app/content_main.h"
 #include "content/public/browser/browser_thread.h"
 #include "content/public/common/content_switches.h"
 #include "content/public/common/main_function_params.h"
 #include "content/public/common/network_service_test.mojom.h"
 #include "content/public/common/service_manager_connection.h"
 #include "content/public/common/service_names.mojom.h"
 #include "content/public/test/test_launcher.h"
 #include "content/public/test/test_utils.h"
 #include "content/test/content_browser_sanity_checker.h"
+#include "mojo/public/cpp/bindings/sync_call_restrictions.h"
 #include "net/dns/mock_host_resolver.h"
 #include "net/test/embedded_test_server/embedded_test_server.h"
 #include "services/service_manager/public/cpp/connector.h"
 #include "ui/base/platform_window_defaults.h"
 #include "ui/base/test/material_design_controller_test_api.h"
 #include "ui/compositor/compositor_switches.h"
 #include "ui/gl/gl_implementation.h"
 #include "ui/gl/gl_switches.h"
 
 #if defined(OS_POSIX)
@@ skipping 354 matching lines @@
     mojo_rule->replacement = rule.replacement;
     mojo_rules.push_back(std::move(mojo_rule));
   }
 
   if (mojo_rules.empty())
     return;
 
   mojom::NetworkServiceTestPtr network_service_test;
   ServiceManagerConnection::GetForProcess()->GetConnector()->BindInterface(
       mojom::kNetworkServiceName, &network_service_test);
+  mojo::SyncCallRestrictions::ScopedAllowSyncCall allow_sync_call;
   network_service_test->AddRules(std::move(mojo_rules));
 }
 
 }  // namespace content