patches/ublock: install ublock as component extension

- locked down and reconfigured component behavior
- set up localization of manifest.json
- todo: split up extensions/browser/extension_registrar.cc
  into separate patch and credit brave
- added ui for extension settings to indicate u0 is a helium
  component
- migration and services stuff, almost done
- fix ublock re-enabling on next launch when disabled
- more reliably refresh assets.json on pref change
- add ublock pref to settings
- refresh patches
- part 5: pin by default, update incognito preference

devutils/clear-ublock-assets.js

@@ -0,0 +1,61 @@
+// Copyright 2025 The Helium Authors
+// You can use, redistribute, and/or modify this source code under
+// the terms of the GPL-3.0 license that can be found in the LICENSE file.
+
+// Program for updating the assets.json file in uB0 to disable all
+// outgoing connections before the user is able to consent to them.
+
+const fs = require('fs');
+
+const err = () => {
+  console.error('usage: node clear-ublock-assets <path to uB0 assets.json');
+  process.exit(1);
+}
+
+const assets_path = process.argv[2] || err();
+
+const stripURLs = (c) =>
+  [c].flat().filter(s => !URL.canParse(s));
+
+const breakKey = (obj, key_) => {
+  const keys = Object.keys(obj);
+  const idx = keys.indexOf(key_);
+
+  if (idx === -1) {
+    return;
+  }
+
+  for (let key of keys.splice(idx)) {
+    const val = obj[key];
+    delete obj[key];
+
+    if (key === key_) {
+      key = `^${key}`;
+    }
+
+    obj[key] = val;
+  }
+}
+
+const clear = obj => {
+  for (const filter of Object.values(obj)) {
+    if (filter.off) {
+      continue;
+    }
+
+    filter.contentURL = stripURLs(filter.contentURL);
+    breakKey(filter, 'cdnURLs');
+    breakKey(filter, 'patchURLs');
+  }
+
+  return obj;
+}
+
+fs.writeFileSync(
+  assets_path,
+  JSON.stringify(clear(
+    JSON.parse(fs.readFileSync(
+      assets_path
+    ))
+  ), null, '\t') + '\n'
+);