Fix (nearly all) IWYU in fpdfskd/include/javascript/ headers.

fpdfsdk/include/javascript/app.h

 // Copyright 2014 PDFium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
  
 // Original code copyright 2014 Foxit Software Inc. http://www.foxitsoftware.com
 
 #ifndef _APP_H_
 #define _APP_H_
 
+#include "JS_Define.h"
+
 class CJS_Runtime;
 
 /* ---------------------------- TimerObj ---------------------------- */
 
 class CJS_Timer;
 
 class TimerObj : public CJS_EmbedObj
 {
 public:
         TimerObj(CJS_Object* pJSObject);
@@ skipping 192 matching lines @@
         JS_STATIC_METHOD(openFDF, app);
         JS_STATIC_METHOD(popUpMenuEx, app);
         JS_STATIC_METHOD(popUpMenu, app);
         JS_STATIC_METHOD(response, app);
         JS_STATIC_METHOD(setInterval, app);
         JS_STATIC_METHOD(setTimeOut, app);
 
 };
 
 #endif //_APP_H_