Get rid of NULLs in core/

core/fpdfdoc/include/fpdf_doc.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 CORE_FPDFDOC_INCLUDE_FPDF_DOC_H_
 #define CORE_FPDFDOC_INCLUDE_FPDF_DOC_H_
 
 #include <map>
@@ skipping 26 matching lines @@
 class CPDF_FormControl;
 class CPDF_FormField;
 class CPDF_IconFit;
 class CPDF_Link;
 class CPDF_Metadata;
 class CPDF_OCContext;
 class CPDF_Page;
 class CPDF_PageObject;
 class CPDF_RenderContext;
 class CPDF_RenderOptions;
-class CPDF_ViewerPreferences;
 class CXML_Element;
 class IPDF_FormNotify;
 
 enum class BorderStyle { SOLID, DASH, BEVELED, INSET, UNDERLINE };
 
 class CPDF_NameTree {
  public:
   explicit CPDF_NameTree(CPDF_Dictionary* pRoot) : m_pRoot(pRoot) {}
   CPDF_NameTree(CPDF_Document* pDoc, const CFX_ByteString& category);
 
@@ skipping 834 matching lines @@
   explicit CPDF_ViewerPreferences(CPDF_Document* pDoc);
   ~CPDF_ViewerPreferences();
 
   FX_BOOL IsDirectionR2L() const;
   FX_BOOL PrintScaling() const;
   int32_t NumCopies() const;
   CPDF_Array* PrintPageRange() const;
   CFX_ByteString Duplex() const;
 
  protected:
+  CPDF_Dictionary* GetViewerPreferences() const;
+
   CPDF_Document* const m_pDoc;
 };
 
 class CPDF_ApSettings {
  public:
   explicit CPDF_ApSettings(CPDF_Dictionary* pDict);
 
   bool HasMKEntry(const CFX_ByteString& csEntry) const;
   int GetRotation() const;
 
@@ skipping 42 matching lines @@
   CFX_WideString GetCaption(const CFX_ByteString& csEntry) const;
   CPDF_Stream* GetIcon(const CFX_ByteString& csEntry) const;
 
   CPDF_Dictionary* const m_pDict;
 };
 
 CPDF_Stream* FPDFDOC_GetAnnotAP(CPDF_Dictionary* pAnnotDict,
                                 CPDF_Annot::AppearanceMode mode);
 
 #endif  // CORE_FPDFDOC_INCLUDE_FPDF_DOC_H_