Resolve fde_xml.h header collision

BUILD.gn

 # Copyright 2014 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 869 matching lines @@
       "xfa/src/fdp/src/fde/fde_geobject.cpp",
       "xfa/src/fdp/src/fde/fde_geobject.h",
       "xfa/src/fdp/src/fde/fde_iterator.cpp",
       "xfa/src/fdp/src/fde/fde_iterator.h",
       "xfa/src/fdp/src/fde/fde_object.cpp",
       "xfa/src/fdp/src/fde/fde_object.h",
       "xfa/src/fdp/src/fde/fde_render.cpp",
       "xfa/src/fdp/src/fde/fde_render.h",
       "xfa/src/fdp/src/tto/fde_textout.cpp",
       "xfa/src/fdp/src/tto/fde_textout.h",
-      "xfa/src/fdp/src/xml/fde_xml.cpp",
-      "xfa/src/fdp/src/xml/fde_xml.h",
+      "xfa/src/fdp/src/xml/fde_xml_imp.cpp",
+      "xfa/src/fdp/src/xml/fde_xml_imp.h",
       "xfa/src/fee/include/fx_wordbreak.h",
       "xfa/src/fee/include/ifde_txtedtbuf.h",
       "xfa/src/fee/include/ifde_txtedtengine.h",
       "xfa/src/fee/include/ifde_txtedtpage.h",
       "xfa/src/fee/src/fee/fde_txtedtblock.cpp",
       "xfa/src/fee/src/fee/fde_txtedtblock.h",
       "xfa/src/fee/src/fee/fde_txtedtbuf.cpp",
       "xfa/src/fee/src/fee/fde_txtedtbuf.h",
       "xfa/src/fee/src/fee/fde_txtedtengine.cpp",
       "xfa/src/fee/src/fee/fde_txtedtengine.h",
@@ skipping 615 matching lines @@
       "//v8:v8_libplatform",
     ]
     include_dirs += [
       "//v8",
       "//v8/include",
     ]
     configs += [ "//v8:external_startup_data" ]
   }
   configs += [ ":pdfium_config" ]
 }