Remove IFX_SystemHandler.

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': {
     # TODO(thakis): Enable this, pdfium:29
     #'chromium_code': 1,
 
     'variables': {
@@ skipping 106 matching lines @@
         'fpdftext',
         'formfiller',
         'fxcodec',
         'fxcrt',
         'fxedit',
         'fxge',
         'javascript',
         'pdfwindow',
       ],
       'sources': [
+        'fpdfsdk/cfx_systemhandler.cpp',
+        'fpdfsdk/cfx_systemhandler.h',
         'fpdfsdk/include/fsdk_actionhandler.h',
         'fpdfsdk/include/fsdk_annothandler.h',
         'fpdfsdk/include/fsdk_baseannot.h',
         'fpdfsdk/include/fsdk_baseform.h',
         'fpdfsdk/fpdfdoc.cpp',
         'fpdfsdk/fpdfeditimg.cpp',
         'fpdfsdk/fpdfeditpage.cpp',
         'fpdfsdk/fpdfformfill.cpp',
         'fpdfsdk/fpdfppo.cpp',
         'fpdfsdk/fpdfsave.cpp',
@@ skipping 932 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',
           ],
         },
       ]
     }],
   ]
 }