Remove fx_freetype_warnings config.

The warnings no longer occur as of the FreeType DEPS roll in
https://pdfium-review.googlesource.com/54410.

Change-Id: Ia7b4eee5854d43819db0dbbb63b49b29ba419c50
Reviewed-on: https://pdfium-review.googlesource.com/c/pdfium/+/69872
Commit-Queue: Lei Zhang <thestig@chromium.org>
Reviewed-by: Tom Sepez <tsepez@chromium.org>

third_party/BUILD.gn

diff --git a/third_party/BUILD.gn b/third_party/BUILD.gn
index 4d6f5bf..42e68f6 100644
--- a/third_party/BUILD.gn
+++ b/third_party/BUILD.gn
@@ -47,20 +47,6 @@
 }
 
 if (pdf_bundle_freetype) {
-  config("fx_freetype_warnings") {
-    visibility = [ ":*" ]
-    if (is_clang) {
-      # open_face_PS_from_sfnt_stream() and open_face_from_buffer() in
-      # ftbase.h are unused.
-      #
-      # ttgload.c casts from unsigned int to unsigned long to void*.
-      cflags = [
-        "-Wno-unused-function",
-        "-Wno-int-to-void-pointer-cast",
-      ]
-    }
-  }
-
   config("freetype_public_includes_config") {
     # The relative freetype/include path points to PDFium's custom config.
     # The absolute path points to whatever copy of FreeType is in
@@ -85,9 +71,6 @@
     configs += [
       "//build/config/compiler:no_chromium_code",
       ":pdfium_third_party_config",
-
-      # Must be after no_chromium_code for warning flags to be ordered correctly.
-      ":fx_freetype_warnings",
     ]
 
     public_configs = [ ":freetype_public_includes_config" ]