Use puts() instead of pluginLog() to avoid running JS during detach.

content/shell/tools/plugin/main.cpp

 // Copyright 2014 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.
 
 /*
  * Copyright (C) 2006, 2007 Apple 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:
@@ skipping 330 matching lines @@
 
         if (obj->onSetWindow)
             free(obj->onSetWindow);
 
         if (obj->onPaintEvent)
             free(obj->onPaintEvent);
 
         if (obj->evaluateScriptOnMouseDownOrKeyDown)
             free(obj->evaluateScriptOnMouseDownOrKeyDown);
 
-        if (obj->logDestroy)
-            pluginLog(instance, "NPP_Destroy");
+        if (obj->logDestroy) {
+            // Note: this intentionally avoids using pluginLog(), because that
+            // requires running JS during document detach, which is forbidden.
+            puts("PLUGIN: NPP_Destroy");
+        }
 
 #ifdef XP_MACOSX
         if (obj->coreAnimationLayer)
             CFRelease(obj->coreAnimationLayer);
 #endif
 
         if (obj->pluginTest)
             obj->pluginTest->NPP_Destroy(save);
 
         browser->releaseobject(&obj->header);
@@ skipping 524 matching lines @@
 {
     return "application/x-webkit-test-netscape:testnetscape:test netscape content;image/png:png:PNG image";
 }
 
 extern "C"
 NPError NP_GetValue(NPP instance, NPPVariable variable, void* value)
 {
     return NPP_GetValue(instance, variable, value);
 }
 #endif