nacl: Fix a bunch of compiler warnings

ppapi/proxy/plugin_main_nacl.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 <map>
 #include <set>
 
 #include "build/build_config.h"
 // Need to include this before most other files because it defines
 // IPC_MESSAGE_LOG_ENABLED. We need to use it to define
@@ skipping 118 matching lines @@
            plugin_dispatchers_.find(id) != plugin_dispatchers_.end());
   plugin_dispatchers_[id] = plugin_dispatcher;
   return id;
 }
 
 void PpapiDispatcher::Unregister(uint32 plugin_dispatcher_id) {
   plugin_dispatchers_.erase(plugin_dispatcher_id);
 }
 
 bool PpapiDispatcher::SendToBrowser(IPC::Message* msg) {
-  Send(msg);
+  return Send(msg);
 }
 
 IPC::Sender* PpapiDispatcher::GetBrowserSender() {
   return this;
 }
 
 std::string PpapiDispatcher::GetUILanguage() {
   NOTIMPLEMENTED();
   return std::string();
 }
@@ skipping 112 matching lines @@
   PpapiDispatcher ppapi_dispatcher(io_thread.message_loop_proxy());
   plugin_globals.set_plugin_proxy_delegate(&ppapi_dispatcher);
 
   loop.Run();
 
   NaClSrpcModuleFini();
 
   return 0;
 }