[Extensions] Enable the per-extension user script toggle by default.

Bug: 390138269
Change-Id: I74f9faf4de96750c891eafe8635db88a4d4a4eda
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/6564287
Commit-Queue: David Bertoni <dbertoni@chromium.org>
Auto-Submit: Justin Lulejian <jlulejian@chromium.org>
Reviewed-by: David Bertoni <dbertoni@chromium.org>
Cr-Commit-Position: refs/heads/main@{#1463571}
diff --git a/extensions/common/extension_features.cc b/extensions/common/extension_features.cc
index 823c1ca5..da09dd56 100644
--- a/extensions/common/extension_features.cc
+++ b/extensions/common/extension_features.cc
@@ -223,7 +223,7 @@
 
 BASE_FEATURE(kUserScriptUserExtensionToggle,
              "UserScriptUserExtensionToggle",
-             base::FEATURE_DISABLED_BY_DEFAULT);
+             base::FEATURE_ENABLED_BY_DEFAULT);
 
 BASE_FEATURE(kDebuggerAPIRestrictedToDevMode,
              "DebuggerAPIRestrictedToDevMode",