Add missing header files to GN files

third_party/libxml/BUILD.gn

 # Copyright (c) 2013 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.
 
 # Define an "os_include" variable that points at the OS-specific generated
 # headers.  These were generated by running the configure script offline.
 if (is_linux || is_android || is_nacl) {
   os_include = "linux"
 } else if (is_mac || is_ios) {
   os_include = "mac"
@@ skipping 88 matching lines @@
     "src/include/libxml/c14n.h",
     "src/include/libxml/catalog.h",
     "src/include/libxml/chvalid.h",
     "src/include/libxml/debugXML.h",
     "src/include/libxml/dict.h",
     "src/include/libxml/encoding.h",
     "src/include/libxml/entities.h",
     "src/include/libxml/globals.h",
     "src/include/libxml/hash.h",
     "src/include/libxml/list.h",
+    "src/include/libxml/nanoftp.h",
+    "src/include/libxml/nanohttp.h",
     "src/include/libxml/parser.h",
     "src/include/libxml/parserInternals.h",
     "src/include/libxml/pattern.h",
     "src/include/libxml/relaxng.h",
     "src/include/libxml/schemasInternals.h",
     "src/include/libxml/schematron.h",
     "src/include/libxml/threads.h",
     "src/include/libxml/tree.h",
     "src/include/libxml/uri.h",
     "src/include/libxml/valid.h",
@@ skipping 23 matching lines @@
     "src/list.c",
     "src/parser.c",
     "src/parserInternals.c",
     "src/pattern.c",
     "src/relaxng.c",
     "src/save.h",
     "src/schematron.c",
     "src/threads.c",
     "src/timsort.h",
     "src/tree.c",
+    "src/triodef.h",
+    "src/trionan.h",
 
     #"src/trio.c",
     #"src/trio.h",
     #"src/triodef.h",
     #"src/trionan.c",
     #"src/trionan.h",
     #"src/triop.h",
     #"src/triostr.c",
     #"src/triostr.h",
     "src/uri.c",
@@ skipping 39 matching lines @@
   if (is_mac || is_ios || is_android) {
     # http://www.xmlsoft.org/threads.html says that this is required when using
     # libxml from several threads, which can possibly happen in chrome. On
     # linux, this is picked up by transitivity from pkg-config output from
     # build/linux/system.gyp.
     defines = [ "_REENTRANT" ]
   }
 
   include_dirs = [ "$os_include" ]
 }