Pepper: Simplify LaunchSelLdr error reporting.

ppapi/native_client/src/trusted/plugin/sel_ldr_launcher_chrome.cc

Index: ppapi/native_client/src/trusted/plugin/sel_ldr_launcher_chrome.cc
diff --git a/ppapi/native_client/src/trusted/plugin/sel_ldr_launcher_chrome.cc b/ppapi/native_client/src/trusted/plugin/sel_ldr_launcher_chrome.cc
index d27de7e459776fcfb537a4b407fb435dffed3cbd..a5789d610e94c156aef9394dc84dc512218ec5d6 100644
--- a/ppapi/native_client/src/trusted/plugin/sel_ldr_launcher_chrome.cc
+++ b/ppapi/native_client/src/trusted/plugin/sel_ldr_launcher_chrome.cc
@@ -19,6 +19,7 @@ bool SelLdrLauncherChrome::Start(const char* url) {
 
 void SelLdrLauncherChrome::Start(
     PP_Instance instance,
+    bool main_service_runtime,
     const char* url,
     bool uses_irt,
     bool uses_ppapi,
@@ -29,13 +30,13 @@ void SelLdrLauncherChrome::Start(
     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),
@@ -47,7 +48,6 @@ void SelLdrLauncherChrome::Start(
                       manifest_service_interface,
                       manifest_service_user_data,
                       &channel_,
-                      error_message,
                       callback.pp_completion_callback());
 }