Drop NaCl support for posting stdout/stderr to JS.

ppapi/native_client/src/trusted/plugin/service_runtime.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.
  */
 
 #define NACL_LOG_MODULE_NAME "Plugin_ServiceRuntime"
 
 #include "ppapi/native_client/src/trusted/plugin/service_runtime.h"
 
@@ skipping 66 matching lines @@
 
 void PluginReverseInterface::ShutDown() {
   NaClLog(4, "PluginReverseInterface::Shutdown: entered\n");
   nacl::MutexLocker take(&mu_);
   shutting_down_ = true;
   NaClXCondVarBroadcast(&cv_);
   NaClLog(4, "PluginReverseInterface::Shutdown: broadcasted, exiting\n");
 }
 
 void PluginReverseInterface::DoPostMessage(nacl::string message) {
-  std::string full_message = std::string("DEBUG_POSTMESSAGE:") + message;
-  GetNaClInterface()->PostMessageToJavaScript(pp_instance_,
-                                              full_message.c_str());
+  // This feature is no longer used.
+  // TODO(teravest): Remove this once this is gone from nacl::ReverseInterface.
 }
 
 void PluginReverseInterface::StartupInitializationComplete() {
   NaClLog(4, "PluginReverseInterface::StartupInitializationComplete\n");
   if (init_done_cb_.pp_completion_callback().func != NULL) {
     NaClLog(4,
             "PluginReverseInterface::StartupInitializationComplete:"
             " invoking CB\n");
     pp::Module::Get()->core()->CallOnMainThread(0, init_done_cb_, PP_OK);
   } else {
@@ skipping 477 matching lines @@
     reverse_service_->Unref();
 
   rev_interface_->Unref();
 
   anchor_->Unref();
   NaClCondVarDtor(&cond_);
   NaClMutexDtor(&mu_);
 }
 
 }  // namespace plugin