Replace "nested message loop" with "nested run loop" in comments.

content/renderer/pepper/host_globals.cc

Index: content/renderer/pepper/host_globals.cc
diff --git a/content/renderer/pepper/host_globals.cc b/content/renderer/pepper/host_globals.cc
index 0ebab6434d9ee6b25937549f5a4ae7ad925df1e4..4dd5b743c4a4415e040aa785b743800d96c3ca27 100644
--- a/content/renderer/pepper/host_globals.cc
+++ b/content/renderer/pepper/host_globals.cc
@@ -148,7 +148,7 @@ void HostGlobals::LogWithSource(PP_Instance instance,
                                 const std::string& value) {
   PepperPluginInstanceImpl* instance_object =
       HostGlobals::Get()->GetInstance(instance);
-  // It's possible to process this message in a nested message loop while
+  // It's possible to process this message in a nested run loop while
   // detaching a Document…
   // TODO(dcheng): Make it so this can't happen. https://crbug.com/561683
   if (instance_object &&