Get rid of NULLs in xfa/

xfa/fxfa/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 "xfa/fxfa/include/xfa_ffapp.h"
 
 #include <algorithm>
 #include <utility>
@@ skipping 96 matching lines @@
   }
   return m_pDocHandler;
 }
 CXFA_FFDoc* CXFA_FFApp::CreateDoc(IXFA_DocProvider* pProvider,
                                   IFX_FileRead* pStream,
                                   FX_BOOL bTakeOverFile) {
   CXFA_FFDoc* pDoc = new CXFA_FFDoc(this, pProvider);
   FX_BOOL bSuccess = pDoc->OpenDoc(pStream, bTakeOverFile);
   if (!bSuccess) {
     delete pDoc;
-    pDoc = NULL;
+    pDoc = nullptr;
   }
   return pDoc;
 }
 CXFA_FFDoc* CXFA_FFApp::CreateDoc(IXFA_DocProvider* pProvider,
                                   CPDF_Document* pPDFDoc) {
-  if (pPDFDoc == NULL) {
-    return NULL;
-  }
+  if (!pPDFDoc)
+    return nullptr;
+
   CXFA_FFDoc* pDoc = new CXFA_FFDoc(this, pProvider);
   FX_BOOL bSuccess = pDoc->OpenDoc(pPDFDoc);
   if (!bSuccess) {
     delete pDoc;
-    pDoc = NULL;
+    pDoc = nullptr;
   }
   return pDoc;
 }
 
 void CXFA_FFApp::SetDefaultFontMgr(std::unique_ptr<CXFA_DefFontMgr> pFontMgr) {
   if (!m_pFontMgr)
     m_pFontMgr = new CXFA_FontMgr();
   m_pFontMgr->SetDefFontMgr(std::move(pFontMgr));
 }
 
@@ skipping 24 matching lines @@
     m_pAdapterWidgetMgr = new CXFA_FWLAdapterWidgetMgr;
     pDelegate->OnSetCapability(FWL_WGTMGR_DisableThread |
                                FWL_WGTMGR_DisableForm);
     m_pWidgetMgrDelegate = pDelegate;
   }
   return m_pAdapterWidgetMgr;
 }
 IFWL_AdapterTimerMgr* CXFA_FFApp::GetTimerMgr() {
   return m_pProvider->GetTimerMgr();
 }