Cleanup unused fgas/ code.

BUILD.gn

 # Copyright 2016 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 import("//build_overrides/v8.gni")
 import("//testing/test.gni")
 import("pdfium.gni")
 
 config("pdfium_config") {
   cflags = []
@@ skipping 961 matching lines @@
       "xfa/fgas/layout/fgas_rtfbreak.h",
       "xfa/fgas/layout/fgas_textbreak.cpp",
       "xfa/fgas/layout/fgas_textbreak.h",
       "xfa/fgas/layout/fgas_unicode.cpp",
       "xfa/fgas/layout/fgas_unicode.h",
       "xfa/fgas/localization/fgas_datetime.cpp",
       "xfa/fgas/localization/fgas_datetime.h",
       "xfa/fgas/localization/fgas_locale.cpp",
       "xfa/fgas/localization/fgas_locale.h",
       "xfa/fgas/localization/fgas_localeimp.h",
-      "xfa/fgas/localization/fgas_localemgr.cpp",
-      "xfa/fgas/localization/fgas_localemgr.h",
       "xfa/fgas/xml/fgas_sax.cpp",
       "xfa/fgas/xml/fgas_sax.h",
       "xfa/fwl/basewidget/fwl_barcodeimp.cpp",
       "xfa/fwl/basewidget/fwl_barcodeimp.h",
       "xfa/fwl/basewidget/fwl_caretimp.cpp",
       "xfa/fwl/basewidget/fwl_caretimp.h",
       "xfa/fwl/basewidget/fwl_checkboximp.cpp",
       "xfa/fwl/basewidget/fwl_checkboximp.h",
       "xfa/fwl/basewidget/fwl_comboboximp.cpp",
       "xfa/fwl/basewidget/fwl_comboboximp.h",
@@ skipping 712 matching lines @@
 }
 
 if (pdf_is_standalone) {
   source_set("samples") {
     testonly = true
     deps = [
       "//samples",
     ]
   }
 }