Remove whole include redundancies from Source directory.

Source/testing/plugin/Tests/GetUserAgentWithNullNPPFromNPPNew.cpp

 /*
  * Copyright (C) 2010 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:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
  *    notice, this list of conditions and the following disclaimer in the
  *    documentation and/or other materials provided with the distribution.
  *
  * THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS''
  * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
  * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS
  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY 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 "PluginTest.h"
 
-#include "PluginTest.h"
-
 #include "PluginObject.h"
 
 using namespace std;
 
 // Trying to get the user agent with a null instance from NPP_New.
 
 class GetUserAgentWithNullNPPFromNPPNew : public PluginTest {
 public:
     GetUserAgentWithNullNPPFromNPPNew(NPP npp, const string& identifier)
         : PluginTest(npp, identifier)
     {
     }
 
 private:
     virtual NPError NPP_New(NPMIMEType pluginType, uint16_t mode, int16_t argc, char *argn[], char *argv[], NPSavedData *saved)
     {
         if (!browser->uagent(0))
             pluginLog(m_npp, "FAILURE: Null user agent returned.");
         else
             pluginLog(m_npp, "SUCCESS!");
 
         return NPERR_NO_ERROR;
     }
 
 };
 
 static PluginTest::Register<GetUserAgentWithNullNPPFromNPPNew> getUserAgentWithNullNPPFromNPPNew("get-user-agent-with-null-npp-from-npp-new");