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

third_party/WebKit/Source/core/loader/DocumentLoader.cpp

 /*
  * Copyright (C) 2006, 2007, 2008 Apple Inc. All rights reserved.
  * Copyright (C) 2011 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  *
  * 1.  Redistributions of source code must retain the above copyright
  *     notice, this list of conditions and the following disclaimer.
@@ skipping 690 matching lines @@
                                   size_t length) {
   DCHECK(data);
   DCHECK(length);
   DCHECK_EQ(resource, main_resource_);
   DCHECK(!response_.IsNull());
   DCHECK(!frame_->GetPage()->Suspended());
 
   if (in_data_received_) {
     // If this function is reentered, defer processing of the additional data to
     // the top-level invocation. Reentrant calls can occur because of web
-    // platform (mis-)features that require running a nested message loop:
+    // platform (mis-)features that require running a nested run loop:
     // - alert(), confirm(), prompt()
     // - Detach of plugin elements.
     // - Synchronous XMLHTTPRequest
     data_buffer_->Append(data, length);
     return;
   }
 
   AutoReset<bool> reentrancy_protector(&in_data_received_, true);
   ProcessData(data, length);
 
@@ skipping 381 matching lines @@
                      InstallNewDocumentReason::kJavascriptURL,
                      kForceSynchronousParsing, KURL());
   if (!source.IsNull())
     writer_->AppendReplacingData(source);
   EndWriting();
 }
 
 DEFINE_WEAK_IDENTIFIER_MAP(DocumentLoader);
 
 }  // namespace blink