NaCl: clean up nexe loading logic in trusted plugin.

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

Index: ppapi/native_client/src/trusted/plugin/plugin.cc
diff --git a/ppapi/native_client/src/trusted/plugin/plugin.cc b/ppapi/native_client/src/trusted/plugin/plugin.cc
index 7bb9cf884e6646bd9a45dc9519cf16efe8bbc0d6..c7d9069662585e5dbbb6a793405e24204644edeb 100644
--- a/ppapi/native_client/src/trusted/plugin/plugin.cc
+++ b/ppapi/native_client/src/trusted/plugin/plugin.cc
@@ -111,17 +111,13 @@ bool Plugin::LoadHelperNaClModule(PP_FileHandle file_handle,
   // We can't use pp::BlockUntilComplete() inside an in-process plugin, so we
   // have to roll our own blocking logic, similar to WaitForSelLdrStart()
   // above, except without timeout logic.
-  bool nexe_started = false;
-  pp::CompletionCallback nexe_started_callback = callback_factory_.NewCallback(
-      &Plugin::SignalNexeStarted, &nexe_started, service_runtime);
   pp::Module::Get()->core()->CallOnMainThread(
       0,
       callback_factory_.NewCallback(
           &Plugin::LoadNexeAndStart,
-          service_runtime, info, nexe_started_callback));
-  service_runtime->WaitForNexeStart();
-
-  return nexe_started;
+          service_runtime,
+          info));
+  return service_runtime->WaitForNexeStart();
 }
 
 void Plugin::StartSelLdrOnMainThread(int32_t pp_error,
@@ -144,13 +140,6 @@ void Plugin::SignalStartSelLdrDone(int32_t pp_error,
   service_runtime->SignalStartSelLdrDone();
 }
 
-void Plugin::SignalNexeStarted(int32_t pp_error,
-                               bool* started,
-                               ServiceRuntime* service_runtime) {
-  *started = (pp_error == PP_OK);
-  service_runtime->SignalNexeStarted();
-}
-
 void Plugin::LoadNaClModule(PP_NaClFileInfo file_info,
                             bool uses_nonsfi_mode,
                             bool enable_dyncode_syscalls,
@@ -190,20 +179,18 @@ void Plugin::LoadNaClModule(PP_NaClFileInfo file_info,
   // We don't take any action once nexe loading has completed, so pass an empty
   // callback here for |callback|.
   pp::CompletionCallback callback = callback_factory_.NewCallback(
-      &Plugin::LoadNexeAndStart,
-      service_runtime, file_info, pp::CompletionCallback());
+      &Plugin::LoadNexeAndStart, service_runtime, file_info);
   StartSelLdrOnMainThread(
       static_cast<int32_t>(PP_OK), service_runtime, params, callback);
 }
 
 void Plugin::LoadNexeAndStart(int32_t pp_error,
                               ServiceRuntime* service_runtime,
-                              PP_NaClFileInfo file_info,
-                              const pp::CompletionCallback& callback) {
+                              PP_NaClFileInfo file_info) {
   CHECK(pp::Module::Get()->core()->IsMainThread());
   if (pp_error != PP_OK)
     return;
-  service_runtime->LoadNexeAndStart(file_info, callback);
+  service_runtime->LoadNexeAndStart(file_info);
 }
 
 bool Plugin::LoadNaClModuleContinuationIntern() {