Enable -Wunused-local-typedef

third_party/libphonenumber/BUILD.gn

Index: third_party/libphonenumber/BUILD.gn
diff --git a/third_party/libphonenumber/BUILD.gn b/third_party/libphonenumber/BUILD.gn
index 22d13475be5fc88f86d5a4ddf3901e55834c4771..2f04ff53735d758a6775553294a02a384380a09a 100644
--- a/third_party/libphonenumber/BUILD.gn
+++ b/third_party/libphonenumber/BUILD.gn
@@ -92,6 +92,16 @@ test("libphonenumber_unittests") {
 
   include_dirs = [ "src/test" ]
 
+  # gn orders flags on a target before flags from configs. The default config
+  # adds -Wall, and these flags have to be after -Wall -- so they need to come
+  # from a config and can't be on the target directly.
+  config("libphonenumber_unittests_warnings") {
+    if (is_clang) {
+      cflags = [ "-Wno-unused-local-typedef" ]
+    }
+  }
+  configs += [ ":libphonenumber_unittests_warnings" ]
+
   deps = [
     ":libphonenumber_without_metadata",
     "//base",