* fix: do not run microtasks in V8Serializer in browser process
* Remove no-op MicrotasksScope in `shell/browser/api/electron_api_auto_updater.cc`
This call was added in https://github.com/electron/electron/pull/40576 as an expansion of `gin_helper::EmitEvent`.
Since this only runs in the browser process and `bool ignore_browser_checkpoint = true` this code is a no-op.
Node should perform a microtask checkpoint if necessary in `node::MakeCallback`.
* Remove no-op MicrotasksScope in `shell/common/api/electron_bindings.cc`
This method is only called by the browser process. The containing function, `ElectronBindings::DidReceiveMemoryDump`, is only used in two places:
* `ElectronBindings::GetProcessMemoryInfo` in the same file, which has a `CHECK` that it's running in the browser process at the top.
* From `shell/browser/api/electron_api_web_contents.cc`, which is only run in the browser process.
Added a DCHECK for clarity and validation.
* Replace `gin_helper::MicrotasksScope` with `v8::MicrotasksScope` in `shell/renderer/`
The browser check is unnecessary in the renderer. Since `gin_helper::MicrotasksScope` will always act exactly like `v8::MicrotasksScope`, it's clear to just use the v8 object directly. This also brings them in line with the many other uses of `v8::MicrotasksScope` in `shell/renderer/`.
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