Rename png_ functions conflicting with chrome.

third_party/BUILD.gn

 # Copyright 2014 PDFium 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("../pdfium.gni")
 
 group("third_party") {
   deps = [
     ":bigint",
     ":fx_freetype",
@@ skipping 280 matching lines @@
     "libpng16/png.c",
     "libpng16/png.h",
     "libpng16/pngconf.h",
     "libpng16/pngdebug.h",
     "libpng16/pngerror.c",
     "libpng16/pngget.c",
     "libpng16/pnginfo.h",
     "libpng16/pnglibconf.h",
     "libpng16/pngmem.c",
     "libpng16/pngpread.c",
+    "libpng16/pngprefix.h",
     "libpng16/pngpriv.h",
     "libpng16/pngread.c",
     "libpng16/pngrio.c",
     "libpng16/pngrtran.c",
     "libpng16/pngrutil.c",
     "libpng16/pngset.c",
     "libpng16/pngstruct.h",
     "libpng16/pngtrans.c",
     "libpng16/pngwio.c",
     "libpng16/pngwrite.c",
     "libpng16/pngwtran.c",
     "libpng16/pngwutil.c",
   ]
 }
 
 if (pdf_enable_xfa) {
   source_set("fx_tiff") {
     configs -= [ "//build/config/compiler:chromium_code" ]
     configs += [
       "//build/config/compiler:no_chromium_code",
       "//third_party/pdfium:pdfium_config",
     ]
-    deps = [ "//third_party:jpeg" ]
+    deps = [
+      "//third_party:jpeg",
+    ]
     sources = [
-      "libtiff/tiffiop.h",
-      "libtiff/tiffvers.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",
@@ skipping 15 matching lines @@
       "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",
+      "libtiff/tiffiop.h",
+      "libtiff/tiffvers.h",
     ]
   }
 }
 
 # TODO(dsinclair): Remove if fixed upstream. https://crbug.com/507712
 config("fx_zlib_warnings") {
   visibility = [ ":*" ]
   if (is_clang) {
     cflags = [ "-Wno-shift-negative-value" ]
   }
@@ skipping 36 matching lines @@
   sources = [
     "base/logging.h",
     "base/macros.h",
     "base/numerics/safe_conversions.h",
     "base/numerics/safe_conversions_impl.h",
     "base/numerics/safe_math.h",
     "base/numerics/safe_math_impl.h",
     "base/stl_util.h",
   ]
 }