Fix path in BUILD.gn file.

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 628 matching lines @@
     "core/fxcrt/include/fx_stream.h",
     "core/fxcrt/include/fx_string.h",
     "core/fxcrt/include/fx_system.h",
     "core/fxcrt/include/fx_ucd.h",
     "core/fxcrt/include/fx_xml.h",
     "core/fxcrt/plex.h",
     "core/fxcrt/xml_int.h",
   ]
   if (pdf_enable_xfa) {
     sources += [
+      "core/fxcrt/fx_arabic.cpp",
       "core/fxcrt/fx_arabic.h",
       "core/fxcrt/fx_basic_maps.cpp",
-      "core/fxcrt/include/fx_arabic.cpp",
       "core/fxcrt/include/fx_arb.h",
     ]
   }
   configs += [ ":pdfium_config" ]
 }
 
 static_library("fxge") {
   deps = [
     "third_party:fx_agg",
   ]
@@ skipping 1057 matching lines @@
       "//v8:v8_libplatform",
     ]
     include_dirs += [
       "//v8",
       "//v8/include",
     ]
     configs += [ "//v8:external_startup_data" ]
   }
   configs += [ ":pdfium_config" ]
 }