Fix BUILD.gn file name.

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 1091 matching lines @@
       "xfa/fwl/lightwidget/cfwl_scrollbar.cpp",
       "xfa/fwl/lightwidget/cfwl_scrollbar.h",
       "xfa/fwl/lightwidget/cfwl_theme.cpp",
       "xfa/fwl/lightwidget/cfwl_theme.h",
       "xfa/fwl/lightwidget/cfwl_tooltip.cpp",
       "xfa/fwl/lightwidget/cfwl_tooltip.h",
       "xfa/fwl/lightwidget/cfwl_widget.cpp",
       "xfa/fwl/lightwidget/cfwl_widget.h",
       "xfa/fwl/lightwidget/cfwl_widgetdelegate.cpp",
       "xfa/fwl/lightwidget/cfwl_widgetdelegate.h",
-      "xfa/fwl/lightwidget/cfwl_widgetproperities.cpp",
+      "xfa/fwl/lightwidget/cfwl_widgetproperties.cpp",
       "xfa/fwl/lightwidget/cfwl_widgetproperties.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",
@@ skipping 547 matching lines @@
       "//v8:v8_libplatform",
     ]
     include_dirs += [
       "//v8",
       "//v8/include",
     ]
     configs += [ "//v8:external_startup_data" ]
   }
   configs += [ ":pdfium_config" ]
 }