Remove some FWL 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 1062 matching lines @@
       "xfa/fwl/core/ifwl_tooltiptarget.h",
       "xfa/fwl/core/ifwl_widget.h",
       "xfa/fwl/core/ifwl_widgetdelegate.h",
       "xfa/fwl/core/ifwl_widgetmgr.h",
       "xfa/fwl/core/ifwl_widgetmgrdelegate.h",
       "xfa/fwl/core/include/ifwl_adaptertimermgr.h",
       "xfa/fwl/lightwidget/cfwl_app.cpp",
       "xfa/fwl/lightwidget/cfwl_app.h",
       "xfa/fwl/lightwidget/cfwl_barcode.cpp",
       "xfa/fwl/lightwidget/cfwl_barcode.h",
-      "xfa/fwl/lightwidget/cfwl_caret.cpp",
-      "xfa/fwl/lightwidget/cfwl_caret.h",
       "xfa/fwl/lightwidget/cfwl_checkbox.cpp",
       "xfa/fwl/lightwidget/cfwl_checkbox.h",
       "xfa/fwl/lightwidget/cfwl_combobox.cpp",
       "xfa/fwl/lightwidget/cfwl_combobox.h",
       "xfa/fwl/lightwidget/cfwl_datetimepicker.cpp",
       "xfa/fwl/lightwidget/cfwl_datetimepicker.h",
       "xfa/fwl/lightwidget/cfwl_edit.cpp",
       "xfa/fwl/lightwidget/cfwl_edit.h",
       "xfa/fwl/lightwidget/cfwl_listbox.cpp",
       "xfa/fwl/lightwidget/cfwl_listbox.h",
@@ skipping 626 matching lines @@
       "//v8:v8_libplatform",
     ]
     include_dirs += [
       "//v8",
       "//v8/include",
     ]
     configs += [ "//v8:external_startup_data" ]
   }
   configs += [ ":pdfium_config" ]
 }