Remove duplicated headers from the testing/ directory

Source/testing/plugin/PluginObject.cpp

 /*
  * Copyright (C) 2006, 2007, 2008 Apple Inc. All rights reserved.
  * Copyright (C) 2009 Holger Hans Peter Freyther
  * Copyright (C) 2010 Collabora Ltd.
  *
  * 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 12 matching lines @@
  * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 
 #include "PluginObject.h"
 
 #include "PluginTest.h"
 #include "TestObject.h"
 #include <assert.h>
-#include <stdarg.h>
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
 
 // Helper function which takes in the plugin window object for logging to the console object.
 static void pluginLogWithWindowObject(NPObject* windowObject, NPP instance, const char* message)
 {
     NPVariant consoleVariant;
     if (!browser->getproperty(instance, windowObject, browser->getstringidentifier("console"), &consoleVariant)) {
         fprintf(stderr, "Failed to retrieve console object while logging: %s\n", message);
@@ skipping 1257 matching lines @@
     DOUBLE_TO_NPVARIANT(242.242, args[4]);
     STRINGZ_TO_NPVARIANT("Hello, World", args[5]);
     OBJECT_TO_NPVARIANT(windowScriptObject, args[6]);
 
     NPVariant result;
     if (browser->invoke(npp, windowScriptObject, testNPInvoke, args, 7, &result))
         browser->releasevariantvalue(&result);
 
     browser->releaseobject(windowScriptObject);
 }