Fail to build with unbound Info.plist substitutions instead of silently dropping them.

ui/base/BUILD.gn

Index: ui/base/BUILD.gn
diff --git a/ui/base/BUILD.gn b/ui/base/BUILD.gn
index 00638b622ae9bef4b9c5bc95d103ac20d02afbd5..eefe30e99dafc6ee7b188a5c2055694dce88e013 100644
--- a/ui/base/BUILD.gn
+++ b/ui/base/BUILD.gn
@@ -6,6 +6,7 @@ import("//build/buildflag_header.gni")
 import("//build/config/compiler/compiler.gni")
 import("//build/config/sanitizers/sanitizers.gni")
 import("//build/config/ui.gni")
+import("//build/util/branding.gni")
 import("//testing/test.gni")
 import("//ui/base/ui_features.gni")
 import("//ui/ozone/ozone.gni")
@@ -1013,6 +1014,7 @@ if (is_mac) {
       "//ui/resources:ui_test_pak_bundle_data",
     ]
     info_plist = "test/framework-Info.plist"
+    extra_substitutions = [ "CHROMIUM_BUNDLE_ID=$chrome_mac_bundle_id" ]
     output_name = "ui_unittests Framework"
   }
 }