Pepper: Simplify LaunchSelLdr error reporting.

ppapi/native_client/src/trusted/plugin/sel_ldr_launcher_chrome.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 "native_client/src/include/nacl_macros.h"
 #include "ppapi/c/pp_errors.h"
 #include "ppapi/cpp/module.h"
 #include "ppapi/native_client/src/trusted/plugin/nacl_entry_points.h"
 #include "ppapi/native_client/src/trusted/plugin/sel_ldr_launcher_chrome.h"
 
 LaunchNaClProcessFunc launch_nacl_process = NULL;
 
 namespace plugin {
 
 bool SelLdrLauncherChrome::Start(const char* url) {
   NACL_NOTREACHED();
   return false;
 }
 
 void SelLdrLauncherChrome::Start(
     PP_Instance instance,
+    bool main_service_runtime,
     const char* url,
     bool uses_irt,
     bool uses_ppapi,
     bool uses_nonsfi_mode,
     bool enable_ppapi_dev,
     bool enable_dyncode_syscalls,
     bool enable_exception_handling,
     bool enable_crash_throttling,
     const PPP_ManifestService* manifest_service_interface,
     void* manifest_service_user_data,
-    PP_Var* error_message,
     pp::CompletionCallback callback) {
   if (!launch_nacl_process) {
     pp::Module::Get()->core()->CallOnMainThread(0, callback, PP_ERROR_FAILED);
     return;
   }
   launch_nacl_process(instance,
+                      PP_FromBool(main_service_runtime),
                       url,
                       PP_FromBool(uses_irt),
                       PP_FromBool(uses_ppapi),
                       PP_FromBool(uses_nonsfi_mode),
                       PP_FromBool(enable_ppapi_dev),
                       PP_FromBool(enable_dyncode_syscalls),
                       PP_FromBool(enable_exception_handling),
                       PP_FromBool(enable_crash_throttling),
                       manifest_service_interface,
                       manifest_service_user_data,
                       &channel_,
-                      error_message,
                       callback.pp_completion_callback());
 }
 
 }  // namespace plugin