NaCl plugin: Make ServiceRuntime::Shutdown() kill the NaCl loader

components/nacl/renderer/nexe_load_manager.cc

Index: components/nacl/renderer/nexe_load_manager.cc
diff --git a/components/nacl/renderer/nexe_load_manager.cc b/components/nacl/renderer/nexe_load_manager.cc
index 302b2b73d47c15bb173c7e089560a52ebea8221c..03cd6cb8ab64ebbf37844d3023b9d83bd7e1450c 100644
--- a/components/nacl/renderer/nexe_load_manager.cc
+++ b/components/nacl/renderer/nexe_load_manager.cc
@@ -295,6 +295,10 @@ void NexeLoadManager::set_manifest_service_channel(
   manifest_service_channel_ = std::move(channel);
 }
 
+void NexeLoadManager::close_trusted_plugin_channel() {
+  trusted_plugin_channel_.reset();
+}
+
 PP_NaClReadyState NexeLoadManager::nacl_ready_state() {
   return nacl_ready_state_;
 }