Several pure virtual IFWL_Adapter* classes not implemented.

xfa/src/fxfa/src/app/xfa_ffapp.cpp

 // 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
 
 #include <algorithm>
 
 #include "xfa/src/foxitlib.h"
 #include "xfa/src/fxfa/src/common/xfa_common.h"
@@ skipping 186 matching lines @@
 }
 IFWL_AdapterThreadMgr* CXFA_FFApp::GetThreadMgr() {
   if (!m_pAdapterThreadMgr) {
     m_pAdapterThreadMgr = new CFWL_SDAdapterThreadMgr;
   }
   return m_pAdapterThreadMgr;
 }
 IFWL_AdapterTimerMgr* CXFA_FFApp::GetTimerMgr() {
   return m_pProvider->GetTimerMgr();
 }
-IFWL_AdapterCursorMgr* CXFA_FFApp::GetCursorMgr() {
-  return NULL;
-}
-IFWL_AdapterMonitorMgr* CXFA_FFApp::GetMonitorMgr() {
-  return NULL;
-}
-IFWL_AdapterClipboardMgr* CXFA_FFApp::GetClipboardMgr() {
-  return NULL;
-}