Get rid of NULLs in xfa/

xfa/fxfa/parser/xfa_basic_imp.h

Index: xfa/fxfa/parser/xfa_basic_imp.h
diff --git a/xfa/fxfa/parser/xfa_basic_imp.h b/xfa/fxfa/parser/xfa_basic_imp.h
index 108b00d00f040e212a7d7628addf281b4dc7ac47..5d114400ca3338e6a66c444a9f13173fb82b0777 100644
--- a/xfa/fxfa/parser/xfa_basic_imp.h
+++ b/xfa/fxfa/parser/xfa_basic_imp.h
@@ -37,7 +37,7 @@ class CXFA_WideTextRead : public IFX_Stream {
   virtual int32_t ReadString(FX_WCHAR* pStr,
                              int32_t iMaxLength,
                              FX_BOOL& bEOS,
-                             int32_t const* pByteSize = NULL);
+                             int32_t const* pByteSize = nullptr);
   virtual int32_t WriteData(const uint8_t* pBuffer, int32_t iBufferSize) {
     return 0;
   }
@@ -57,7 +57,7 @@ class CXFA_WideTextRead : public IFX_Stream {
   virtual IFX_Stream* CreateSharedStream(uint32_t dwAccess,
                                          int32_t iOffset,
                                          int32_t iLength) {
-    return NULL;
+    return nullptr;
   }
 
   CFX_WideString GetSrcText() const { return m_wsBuffer; }