Remove header files that only have includes.

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,
     'pdf_use_skia%': 0,
     'pdf_enable_v8%': 1,
@@ skipping 184 matching lines @@
         'core/src/fpdfdoc/doc_vt.cpp',
         'core/src/fpdfdoc/doc_vtmodule.cpp',
         'core/src/fpdfdoc/pdf_vt.h',
         'core/src/fpdfdoc/tagged_int.h',
       ],
     },
     {
       'target_name': 'fpdfapi',
       'type': 'static_library',
       'sources': [
-        'core/include/fpdfapi/fpdfapi.h',
         'core/include/fpdfapi/fpdf_module.h',
         'core/include/fpdfapi/fpdf_objects.h',
         'core/include/fpdfapi/fpdf_page.h',
         'core/include/fpdfapi/fpdf_pageobj.h',
         'core/include/fpdfapi/fpdf_parser.h',
         'core/include/fpdfapi/fpdf_render.h',
         'core/include/fpdfapi/fpdf_resource.h',
         'core/include/fpdfapi/fpdf_serial.h',
         'core/src/fpdfapi/fpdf_basic_module.cpp',
         'core/src/fpdfapi/fpdf_cmaps/cmap_int.h',
@@ skipping 338 matching lines @@
         }],
       ],
     },
     {
       'target_name': 'fxedit',
       'type': 'static_library',
       'sources': [
         'fpdfsdk/include/fxedit/fx_edit.h',
         'fpdfsdk/include/fxedit/fxet_edit.h',
         'fpdfsdk/include/fxedit/fxet_list.h',
-        'fpdfsdk/include/fxedit/fxet_stub.h',
         'fpdfsdk/src/fxedit/fxet_ap.cpp',
         'fpdfsdk/src/fxedit/fxet_edit.cpp',
         'fpdfsdk/src/fxedit/fxet_list.cpp',
         'fpdfsdk/src/fxedit/fxet_module.cpp',
         'fpdfsdk/src/fxedit/fxet_pageobjs.cpp',
       ],
     },
     {
       'target_name': 'pdfwindow',
       'type': 'static_library',
       'sources': [
-        'fpdfsdk/include/pdfwindow/IPDFWindow.h',
-        'fpdfsdk/include/pdfwindow/PDFWindow.h',
         'fpdfsdk/include/pdfwindow/PWL_Button.h',
         'fpdfsdk/include/pdfwindow/PWL_Caret.h',
         'fpdfsdk/include/pdfwindow/PWL_ComboBox.h',
         'fpdfsdk/include/pdfwindow/PWL_Edit.h',
         'fpdfsdk/include/pdfwindow/PWL_EditCtrl.h',
         'fpdfsdk/include/pdfwindow/PWL_FontMap.h',
         'fpdfsdk/include/pdfwindow/PWL_Icon.h',
         'fpdfsdk/include/pdfwindow/PWL_IconList.h',
         'fpdfsdk/include/pdfwindow/PWL_Label.h',
         'fpdfsdk/include/pdfwindow/PWL_ListBox.h',
@@ skipping 100 matching lines @@
       'sources': [
         'fpdfsdk/include/formfiller/FFL_CBA_Fontmap.h',
         'fpdfsdk/include/formfiller/FFL_CheckBox.h',
         'fpdfsdk/include/formfiller/FFL_ComboBox.h',
         'fpdfsdk/include/formfiller/FFL_FormFiller.h',
         'fpdfsdk/include/formfiller/FFL_IFormFiller.h',
         'fpdfsdk/include/formfiller/FFL_ListBox.h',
         'fpdfsdk/include/formfiller/FFL_PushButton.h',
         'fpdfsdk/include/formfiller/FFL_RadioButton.h',
         'fpdfsdk/include/formfiller/FFL_TextField.h',
-        'fpdfsdk/include/formfiller/FormFiller.h',
         'fpdfsdk/src/formfiller/FFL_CBA_Fontmap.cpp',
         'fpdfsdk/src/formfiller/FFL_CheckBox.cpp',
         'fpdfsdk/src/formfiller/FFL_ComboBox.cpp',
         'fpdfsdk/src/formfiller/FFL_FormFiller.cpp',
         'fpdfsdk/src/formfiller/FFL_IFormFiller.cpp',
         'fpdfsdk/src/formfiller/FFL_ListBox.cpp',
         'fpdfsdk/src/formfiller/FFL_PushButton.cpp',
         'fpdfsdk/src/formfiller/FFL_RadioButton.cpp',
         'fpdfsdk/src/formfiller/FFL_TextField.cpp',
       ],
@@ skipping 93 matching lines @@
           ],
           'dependencies': [
             '<(DEPTH)/v8/tools/gyp/v8.gyp:v8',
             '<(DEPTH)/v8/tools/gyp/v8.gyp:v8_libplatform',
           ],
         }],
       ],
     },
   ],
 }