Use smart pointers for class owned member variables

pdfium.gyp

 # Copyright 2015 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.
 
 {
   'variables': {
     'chromium_code': 1,
     'pdf_use_skia%': 0,
     'pdf_enable_v8%': 1,
     'pdf_enable_xfa%': 0, # Set to 1 by standalone.gypi in a standalone build.
@@ skipping 173 matching lines @@
         'core/fpdfdoc/cpdf_variabletext.cpp',
         'core/fpdfdoc/cpvt_color.cpp',
         'core/fpdfdoc/cpvt_color.h',
         'core/fpdfdoc/cpvt_dash.h',
         'core/fpdfdoc/cpvt_floatrect.h',
         'core/fpdfdoc/cpvt_fontmap.cpp',
         'core/fpdfdoc/cpvt_fontmap.h',
         'core/fpdfdoc/cpvt_generateap.cpp',
         'core/fpdfdoc/cpvt_generateap.h',
         'core/fpdfdoc/cpvt_lineinfo.h',
+        'core/fpdfdoc/cpvt_sectioninfo.cpp',
         'core/fpdfdoc/cpvt_sectioninfo.h',
+        'core/fpdfdoc/cpvt_wordinfo.cpp',
         'core/fpdfdoc/cpvt_wordinfo.h',
         'core/fpdfdoc/csection.cpp',
         'core/fpdfdoc/csection.h',
         'core/fpdfdoc/ctypeset.cpp',
         'core/fpdfdoc/ctypeset.h',
         'core/fpdfdoc/doc_action.cpp',
         'core/fpdfdoc/doc_annot.cpp',
         'core/fpdfdoc/doc_basic.cpp',
         'core/fpdfdoc/doc_bookmark.cpp',
         'core/fpdfdoc/doc_form.cpp',
@@ skipping 823 matching lines @@
             'fpdfsdk/fpdfxfa/include/fpdfxfa_app.h',
             'fpdfsdk/fpdfxfa/include/fpdfxfa_doc.h',
             'fpdfsdk/fpdfxfa/include/fpdfxfa_page.h',
             'fpdfsdk/fpdfxfa/include/fpdfxfa_util.h',
           ],
         },
       ]
     }],
   ]
 }