Simplify LogImpl a bit.

services/log/main.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 <stdio.h>
+
 #include <utility>
 
 #include "mojo/application/application_runner_chromium.h"
 #include "mojo/public/c/system/main.h"
 #include "mojo/public/cpp/application/application_connection.h"
 #include "mojo/public/cpp/application/application_delegate.h"
 #include "mojo/public/cpp/application/interface_factory.h"
 #include "mojo/public/cpp/system/macros.h"
 #include "mojo/services/log/interfaces/log.mojom.h"
 #include "services/log/log_impl.h"
@@ skipping 12 matching lines @@
   // |ApplicationDelegate| override:
   bool ConfigureIncomingConnection(ApplicationConnection* connection) override {
     connection->AddService<Log>(this);
     return true;
   }
 
   // |InterfaceFactory<Log>| implementation:
   // We maintain a separate |LogImpl| for each incoming connection.
   void Create(ApplicationConnection* connection,
               InterfaceRequest<Log> request) override {
-    LogImpl::Create(connection, std::move(request), stderr);
+    LogImpl::Create(connection, std::move(request),
+                    [](const std::string& message) {
+                      fprintf(stderr, "%s\n", message.c_str());
+                    });
   }
 
   MOJO_DISALLOW_COPY_AND_ASSIGN(LogApp);
 };
 
 }  // namespace log
 }  // namespace mojo
 
 MojoResult MojoMain(MojoHandle application_request) {
   mojo::ApplicationRunnerChromium runner(new mojo::log::LogApp());
   return runner.Run(application_request);
 }