third_party/fuchsia: Drop -Wno-nested-anon-types

The -Wnested-anon-types warning was fixed in the Fuchsia repository.

Fixes: b/243045403
Change-Id: Ia40a57b8ad11e443ac59ab7f8f0e61834fc009f1
Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/pigweed/+/108554
Pigweed-Auto-Submit: Wyatt Hepler <hepler@google.com>
Reviewed-by: Matthias Guenther <mrguenther@google.com>
Reviewed-by: Ted Pudlik <tpudlik@google.com>
Commit-Queue: Auto-Submit <auto-submit@pigweed.google.com.iam.gserviceaccount.com>
diff --git a/third_party/fuchsia/BUILD.gn b/third_party/fuchsia/BUILD.gn
index 298e96f..0730b99 100644
--- a/third_party/fuchsia/BUILD.gn
+++ b/third_party/fuchsia/BUILD.gn
@@ -32,17 +32,8 @@
   visibility = [ ":*" ]
 }
 
-# TODO(b/243045403): Fix this warning and remove the flag that disables it.
-config("disable_nested_anon_types") {
-  cflags = [ "-Wno-nested-anon-types" ]
-  visibility = [ ":*" ]
-}
-
 pw_source_set("fit") {
-  public_configs = [
-    ":fit_public_include_path",
-    ":disable_nested_anon_types",
-  ]
+  public_configs = [ ":fit_public_include_path" ]
   public_deps = [ ":stdcompat" ]
   public = [
     "repo/sdk/lib/fit/include/lib/fit/function.h",