/usr/include/poppler/Outline.h is in libpoppler-private-dev 0.62.0-2ubuntu2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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//
// Outline.h
//
// Copyright 2002-2003 Glyph & Cog, LLC
//
//========================================================================
//========================================================================
//
// Modified under the Poppler project - http://poppler.freedesktop.org
//
// All changes made under the Poppler project to this file are licensed
// under GPL version 2 or later
//
// Copyright (C) 2005 Marco Pesenti Gritti <mpg@redhat.com>
// Copyright (C) 2016 Albert Astals Cid <aacid@kde.org>
//
// To see a description of the changes please see the Changelog file that
// came with your tarball or type make ChangeLog if you are building from git
//
//========================================================================
#ifndef OUTLINE_H
#define OUTLINE_H
#ifdef USE_GCC_PRAGMAS
#pragma interface
#endif
#include "Object.h"
#include "CharTypes.h"
class GooString;
class GooList;
class XRef;
class LinkAction;
//------------------------------------------------------------------------
class Outline {
public:
  Outline(Object *outlineObj, XRef *xref);
  ~Outline();
  GooList *getItems() { return items; }
private:
  GooList *items;		// NULL if document has no outline,
				// otherwise, a list of OutlineItem
};
//------------------------------------------------------------------------
class OutlineItem {
public:
  OutlineItem(Dict *dict, XRef *xrefA);
  ~OutlineItem();
  static GooList *readItemList(Object *firstItemRef, XRef *xrefA);
  void open();
  void close();
  Unicode *getTitle() { return title; }
  int getTitleLength() { return titleLen; }
  LinkAction *getAction() { return action; }
  GBool isOpen() { return startsOpen; }
  GBool hasKids() { return firstRef.isRef(); }
  GooList *getKids() { return kids; }
private:
  XRef *xref;
  Unicode *title;
  int titleLen;
  LinkAction *action;
  Object firstRef;
  Object lastRef;
  Object nextRef;
  GBool startsOpen;
  GooList *kids;	// NULL if this item is closed or has no kids,
			// otherwise a list of OutlineItem
};
#endif
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