diff -up chromium-122.0.6261.39/build/config/compiler/BUILD.gn.me chromium-122.0.6261.39/build/config/compiler/BUILD.gn
--- chromium-122.0.6261.39/build/config/compiler/BUILD.gn.me	2024-02-19 21:58:15.835818177 +0100
+++ chromium-122.0.6261.39/build/config/compiler/BUILD.gn	2024-02-19 21:59:11.661880633 +0100
@@ -1856,15 +1856,12 @@ config("default_warnings") {
 
         # TODO(crbug.com/1494809): Evaluate and possibly enable.
         "-Wno-vla-extension",
-
-        # TODO(https://crbug.com/1490607): Fix and re-enable.
-        "-Wno-thread-safety-reference-return",
       ]
 
       if (!is_nacl) {
         cflags_cc += [
           # TODO(https://crbug.com/1513724): Fix and re-enable.
-          "-Wno-c++11-narrowing-const-reference",
+          "-Wno-c++11-narrowing",
         ]
       }
     }