XFA: Upgrade to libtiff 4.0.6.

R=jun_fang@foxitsoftware.com, tsepez@chromium.org

Review URL: https://codereview.chromium.org/1563103002 .
diff --git a/third_party/BUILD.gn b/third_party/BUILD.gn
index 51481dd..ed8037b 100644
--- a/third_party/BUILD.gn
+++ b/third_party/BUILD.gn
@@ -305,42 +305,42 @@
       "//third_party/pdfium:pdfium_config",
     ]
     sources = [
-      "tiff_v403/tiffiop.h",
-      "tiff_v403/tif_aux.c",
-      "tiff_v403/tif_close.c",
-      "tiff_v403/tif_codec.c",
-      "tiff_v403/tif_color.c",
-      "tiff_v403/tif_compress.c",
-      "tiff_v403/tif_dir.c",
-      "tiff_v403/tif_dirinfo.c",
-      "tiff_v403/tif_dirread.c",
-      "tiff_v403/tif_dirwrite.c",
-      "tiff_v403/tif_dumpmode.c",
-      "tiff_v403/tif_error.c",
-      "tiff_v403/tif_extension.c",
-      "tiff_v403/tif_fax3.c",
-      "tiff_v403/tif_fax3sm.c",
-      "tiff_v403/tif_flush.c",
-      "tiff_v403/tif_getimage.c",
-      "tiff_v403/tif_jpeg.c",
-      "tiff_v403/tif_luv.c",
-      "tiff_v403/tif_lzw.c",
-      "tiff_v403/tif_next.c",
-      "tiff_v403/tif_ojpeg.c",
-      "tiff_v403/tif_open.c",
-      "tiff_v403/tif_packbits.c",
-      "tiff_v403/tif_pixarlog.c",
-      "tiff_v403/tif_predict.c",
-      "tiff_v403/tif_print.c",
-      "tiff_v403/tif_read.c",
-      "tiff_v403/tif_strip.c",
-      "tiff_v403/tif_swab.c",
-      "tiff_v403/tif_thunder.c",
-      "tiff_v403/tif_tile.c",
-      "tiff_v403/tif_version.c",
-      "tiff_v403/tif_warning.c",
-      "tiff_v403/tif_write.c",
-      "tiff_v403/tif_zip.c",
+      "libtiff/tiffiop.h",
+      "libtiff/tif_aux.c",
+      "libtiff/tif_close.c",
+      "libtiff/tif_codec.c",
+      "libtiff/tif_color.c",
+      "libtiff/tif_compress.c",
+      "libtiff/tif_dir.c",
+      "libtiff/tif_dirinfo.c",
+      "libtiff/tif_dirread.c",
+      "libtiff/tif_dirwrite.c",
+      "libtiff/tif_dumpmode.c",
+      "libtiff/tif_error.c",
+      "libtiff/tif_extension.c",
+      "libtiff/tif_fax3.c",
+      "libtiff/tif_fax3sm.c",
+      "libtiff/tif_flush.c",
+      "libtiff/tif_getimage.c",
+      "libtiff/tif_jpeg.c",
+      "libtiff/tif_luv.c",
+      "libtiff/tif_lzw.c",
+      "libtiff/tif_next.c",
+      "libtiff/tif_ojpeg.c",
+      "libtiff/tif_open.c",
+      "libtiff/tif_packbits.c",
+      "libtiff/tif_pixarlog.c",
+      "libtiff/tif_predict.c",
+      "libtiff/tif_print.c",
+      "libtiff/tif_read.c",
+      "libtiff/tif_strip.c",
+      "libtiff/tif_swab.c",
+      "libtiff/tif_thunder.c",
+      "libtiff/tif_tile.c",
+      "libtiff/tif_version.c",
+      "libtiff/tif_warning.c",
+      "libtiff/tif_write.c",
+      "libtiff/tif_zip.c",
     ]
   }
 }