[gin] Use GetWrapperTypeInfo() for type checking of gin::Wrappable::FromV8

The implementation assumed that if `Object::Unwrap` succeeds, then the
resulting object is at least a `WrappableBase` and therefore it is
possible to call `WrappableBase::wrapper_info()`. However, on 32-bit
systems, `Object::Unwrap` does not check the type, and therefore the
assumption was wrong. With this CL,
`v8::Object::Wrappable::GetWrapperTypeInfo()` is called instead of
`WrappableBase::wrapper_info()`, which always works as `Object::Wrap`
can only be used with a `v8::Object::Wrappable`.

Bug: 436158991, 345640553
Change-Id: Ic2556305f82a02cc327eb0710d718b5642e5c6d5
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/6955265
Reviewed-by: Michael Lippautz <mlippautz@chromium.org>
Commit-Queue: Andreas Haas <ahaas@chromium.org>
Cr-Commit-Position: refs/heads/main@{#1516478}