Fix a file name typo

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_common_config") {
   cflags = []
@@ skipping 1140 matching lines @@
       "xfa/fwl/theme/cfwl_arrowdata.cpp",
       "xfa/fwl/theme/cfwl_arrowdata.h",
       "xfa/fwl/theme/cfwl_barcodetp.cpp",
       "xfa/fwl/theme/cfwl_barcodetp.h",
       "xfa/fwl/theme/cfwl_carettp.cpp",
       "xfa/fwl/theme/cfwl_carettp.h",
       "xfa/fwl/theme/cfwl_checkboxtp.cpp",
       "xfa/fwl/theme/cfwl_checkboxtp.h",
       "xfa/fwl/theme/cfwl_comboboxtp.cpp",
       "xfa/fwl/theme/cfwl_comboboxtp.h",
-      "xfa/fwl/theme/cfwl_datetimepickedtp.cpp",
+      "xfa/fwl/theme/cfwl_datetimepickertp.cpp",
       "xfa/fwl/theme/cfwl_datetimepickertp.h",
       "xfa/fwl/theme/cfwl_edittp.cpp",
       "xfa/fwl/theme/cfwl_edittp.h",
       "xfa/fwl/theme/cfwl_listboxtp.cpp",
       "xfa/fwl/theme/cfwl_listboxtp.h",
       "xfa/fwl/theme/cfwl_monthcalendartp.cpp",
       "xfa/fwl/theme/cfwl_monthcalendartp.h",
       "xfa/fwl/theme/cfwl_pictureboxtp.cpp",
       "xfa/fwl/theme/cfwl_pictureboxtp.h",
       "xfa/fwl/theme/cfwl_pushbuttontp.cpp",
@@ skipping 480 matching lines @@
 }
 
 if (pdf_is_standalone) {
   source_set("samples") {
     testonly = true
     deps = [
       "//samples",
     ]
   }
 }