Revert of Fix repeated "-Wunknown-pragmas -Wno-error=unknown-pragmas".

tools/grit/grit_rule.gni

Index: tools/grit/grit_rule.gni
diff --git a/tools/grit/grit_rule.gni b/tools/grit/grit_rule.gni
index 4a1fc3e7b242cddcf51873fb8f53251f75acf494..d437ee102fd43074953846557af737dec067a831 100644
--- a/tools/grit/grit_rule.gni
+++ b/tools/grit/grit_rule.gni
@@ -357,7 +357,10 @@
     }
 
     if ((is_linux || is_android) && enable_resource_whitelist_generation) {
-      configs += [ "//build/config/compiler:disable_unknown_pragma" ]
+      cflags = [
+        "-Wunknown-pragmas",
+        "-Wno-error=unknown-pragmas",
+      ]
     }
     visibility = target_visibility
   }