Improve handling of invalid command line in Me2Me host.

remoting/host/host_main.cc

 // Copyright (c) 2013 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.
 //
 // This file implements the common entry point shared by all Chromoting Host
 // processes.
 
 #include "remoting/host/host_main.h"
 
 #include <string>
@@ skipping 184 matching lines @@
   std::string process_type = kProcessTypeHost;
   if (command_line->HasSwitch(kProcessTypeSwitchName)) {
     process_type = command_line->GetSwitchValueASCII(kProcessTypeSwitchName);
   }
 
   MainRoutineFn main_routine = SelectMainRoutine(process_type);
   if (!main_routine) {
     fprintf(stderr, "Unknown process type '%s' specified.",
             process_type.c_str());
     Usage(command_line->GetProgram());
-    return kUsageExitCode;
+    return kInvalidCommandLineExitCode;
   }
 
   // Required to find the ICU data file, used by some file_util routines.
   base::i18n::InitializeICU();
 
   remoting::LoadResources("");
 
   // Invoke the entry point.
   int exit_code = main_routine();
-  if (exit_code == kUsageExitCode) {
+  if (exit_code == kInvalidCommandLineExitCode) {
     Usage(command_line->GetProgram());
   }
 
   remoting::UnloadResources();
 
   return exit_code;
 }
 
 }  // namespace remoting
 
 #if !defined(OS_WIN)
 int main(int argc, char** argv) {
   return remoting::HostMain(argc, argv);
 }
 #endif  // !defined(OS_WIN)