--- build/config/compiler/BUILD.gn.orig
+++ build/config/compiler/BUILD.gn
@@ -1399,14 +1399,14 @@
         "-Wno-user-defined-warnings",
 
         # TODO(thakis): https://crbug.com/753973
-        "-Wno-enum-compare-switch",
+        #"-Wno-enum-compare-switch",
 
         # TODO(hans): https://crbug.com/766891
-        "-Wno-null-pointer-arithmetic",
+        #"-Wno-null-pointer-arithmetic",
 
         # Ignore warnings about MSVC optimization pragmas.
         # TODO(thakis): Only for no_chromium_code? http://crbug.com/505314
-        "-Wno-ignored-pragma-optimize",
+        #"-Wno-ignored-pragma-optimize",
       ]
     } else if (use_xcode_clang) {
       cflags += [