XFA: Move fx_codec's lpng and tiff to third_party/

We did this with the other codecs in master, but these two are
XFA-only, and did not get the same treatment.

Remove some fx_ prefixes in the third-party file names.

R=thestig@chromium.org

Review URL: https://codereview.chromium.org/1392373004 .
diff --git a/third_party/BUILD.gn b/third_party/BUILD.gn
index a6c9520..5814a7d 100644
--- a/third_party/BUILD.gn
+++ b/third_party/BUILD.gn
@@ -234,6 +234,78 @@
   ]
 }
 
+source_set("fx_lpng") {
+  configs -= [ "//build/config/compiler:chromium_code" ]
+  configs += [
+    "//build/config/compiler:no_chromium_code",
+    "//third_party/pdfium:pdfium_config",
+  ]
+  sources = [
+    "lpng_v163/png.h",
+    "lpng_v163/png.c",
+    "lpng_v163/pngerror.c",
+    "lpng_v163/pngget.c",
+    "lpng_v163/pngmem.c",
+    "lpng_v163/pngpread.c",
+    "lpng_v163/pngread.c",
+    "lpng_v163/pngrio.c",
+    "lpng_v163/pngrtran.c",
+    "lpng_v163/pngrutil.c",
+    "lpng_v163/pngset.c",
+    "lpng_v163/pngtrans.c",
+    "lpng_v163/pngwio.c",
+    "lpng_v163/pngwrite.c",
+    "lpng_v163/pngwtran.c",
+    "lpng_v163/pngwutil.c",
+  ]
+}
+
+source_set("fx_tiff") {
+  configs -= [ "//build/config/compiler:chromium_code" ]
+  configs += [
+    "//build/config/compiler:no_chromium_code",
+    "//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",
+  ]
+}
+
 source_set("fx_zlib") {
   configs -= [ "//build/config/compiler:chromium_code" ]
   configs += [