Electron Releases

Description of Change

Mechanical removal of code that nothing references, one commit per area (each commit message lists exactly what went and why it is dead):

• build: chromium_src — chrome sources that were compiled but never linked (theme pack, PiP label/resize/live-caption buttons, chrome's platform_util, predictors, spellcheck policy handlers, …), two targets that were compiled twice (global_accelerator_listener, native_window_tracker), and platform-only files moved under their platform.
• refactor: extensions — the never-registered browserAction.*/pageAction.* function classes, the never-built ExtensionActionAPI keyed service, and two local copies of extensions::util::AllowFileAccess.
• refactor: shell/ — ~25 functions, declarations and stubs with no caller on any platform (OSR guest-view plumbing, FileSelectHelper leftovers, GetSiteInstanceFromAffinity, the render-view-deleted event that existed for the remote module, …).
• refactor: gin_helper/converters — unused ErrorThrower/PromiseBase helpers, CreateDataPropertyCallback, Converter<blink::mojom::Referrer>, Converter<MenuItem::Type>.
• refactor: bindings — the electron_common_environment binding, the electron_browser_printing registration, and native methods JS never calls (_getPreloadScript, _isEvalAllowed, _fromIdIfExists, the shadowed C++ Protocol::IsProtocolHandled, …).
• chore: lib/ — dead JS (WebViewImpl.setupEventProperty, setLayoutZoomLevelLimits, an Electron-20 deprecation log that could never fire, …), ~20 stale internal typings, and the enableWebSQL leftovers (WebSQL was removed in 31; this drops the no-op option from the docs and therefore from electron.d.ts).
• chore: repo — orphaned spec fixtures, scripts, the unreferenced pipeline-electron-build-and-test-and-nan.yml, native-test leftovers (incl. the pyyaml DEPS entry), stale disabled-test entries and CODEOWNERS paths.

Built on Linux; hid/usb/serial files are untouched to avoid conflicting with #53657.

Checklist

• I have built and tested this change
• I have filled out the PR description
• I have reviewed and verified the changes
• relevant API documentation, tutorials, and examples are updated and follow the documentation style guide

Release Notes

Notes: Removed the no-op enableWebSQL web preference from the documentation and TypeScript definitions.