Fix plugin crash caused by removal of EMBED element during NPP_New....

webkit/tools/npapi_layout_test_plugin/main.cpp

 /*
  IMPORTANT:  This Apple software is supplied to you by Apple Computer, Inc. ("Apple") in
  consideration of your agreement to the following terms, and your use, installation,
  modification or redistribution of this Apple software constitutes acceptance of these
  terms.  If you do not agree with these terms, please do not use, install, modify or
  redistribute this Apple software.
 
  In consideration of your agreement to abide by the following terms, and subject to these
  terms, Apple grants you a personal, non-exclusive license, under Apple’s copyrights in
  this original Apple software (the "Apple Software"), to use, reproduce, modify and
@@ skipping 125 matching lines @@
     pluginFuncs->getvalue = NPP_GetValue;
     pluginFuncs->setvalue = NPP_SetValue;
 
     return NPERR_NO_ERROR;
 }
 
 void NPAPI NP_Shutdown(void)
 {
 }
 
+static void executeScript(const PluginObject* obj, const char* script);
+
 NPError NPP_New(NPMIMEType pluginType, NPP instance, uint16 mode, int16 argc, char *argn[], char *argv[], NPSavedData *saved)
 {
     if (browser->version >= 14) {
         PluginObject* obj = (PluginObject*)browser->createobject(instance, getPluginClass());
 
         for (int i = 0; i < argc; i++) {
             if (strcasecmp(argn[i], "onstreamload") == 0 && !obj->onStreamLoad)
                 obj->onStreamLoad = strdup(argv[i]);
             else if (strcasecmp(argn[i], "onStreamDestroy") == 0 && !obj->onStreamDestroy)
                 obj->onStreamDestroy = strdup(argv[i]);
             else if (strcasecmp(argn[i], "onURLNotify") == 0 && !obj->onURLNotify)
                 obj->onURLNotify = strdup(argv[i]);
             else if (strcasecmp(argn[i], "logfirstsetwindow") == 0)
                 obj->logSetWindow = TRUE;
             else if (strcasecmp(argn[i], "logSrc") == 0) {
                 for (int i = 0; i < argc; i++) {
                     if (strcasecmp(argn[i], "src") == 0) {
                         log(instance, "src: %s", argv[i]);
                         fflush(stdout);
                     }
                 }
-            }
+            } else if (strcasecmp(argn[i], "cleardocumentduringnew") == 0)
+                executeScript(obj, "document.body.innerHTML = ''");
         }
 
         instance->pdata = obj;
     }
 
     // On Windows and Unix, plugins only get events if they are windowless.
     return browser->setvalue(instance, NPPVpluginWindowBool, NULL);
 }
 
 NPError NPP_Destroy(NPP instance, NPSavedData **save)
@@ skipping 323 matching lines @@
 const char* NP_GetMIMEDescription(void) {
     // The layout test LayoutTests/fast/js/navigator-mimeTypes-length.html
     // asserts that the number of mimetypes handled by plugins should be
     // greater than the number of plugins.  This isn't true if we're
     // the only plugin and we only handle one mimetype, so specify
     // multiple mimetypes here.
     return "application/x-webkit-test-netscape:testnetscape:test netscape content;"
            "application/x-webkit-test-netscape2:testnetscape2:test netscape content2";
 }
 #endif