Make GYP and GN build consistent for third_party targets

third_party/BUILD.gn

Index: third_party/BUILD.gn
diff --git a/third_party/BUILD.gn b/third_party/BUILD.gn
index 1176e9287534b525ab73b0a7995f08ee5c1a7b96..b97a7858adaeee7f50616e1b85df9d0784ce9197 100644
--- a/third_party/BUILD.gn
+++ b/third_party/BUILD.gn
@@ -328,22 +328,17 @@ source_set("fx_lpng") {
 }
 
 if (pdf_enable_xfa) {
-  config("fx_tiff_warnings") {
-    visibility = [ ":*" ]
-    if (is_win) {
-      cflags = [
-        "/wd4005",  # Macro redefinition for 'WIN32_LEAN_AND_MEAN'.
-      ]
-    }
-  }
   source_set("fx_tiff") {
     configs -= [ "//build/config/compiler:chromium_code" ]
     configs += [
       "//build/config/compiler:no_chromium_code",
       "../:pdfium_config",
-
-      ":fx_tiff_warnings",
     ]
+    if (is_win) {
+      # Need to undefine the macro since it is redefined in
+      # tif_ojpeg.c and tif_jpeg.c.
+      configs -= [ "//build/config/win:lean_and_mean" ]
+    }
     deps = [
       "//third_party:jpeg",
     ]