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Return different functions with the same behavior between cross-origin access and same-origin access for data properties

According to the spec (test), when a data property of cross-origin properties is called, different functions with the same behavior should be returned between cross-origin access and same-origin access.
However, completely the same functions via the same function template are returned currently.

This CL fixes the gap by using a different template for each.

Bug: 715418
Change-Id: Ibb410999e87547ead088a49f86274150783724a1
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1846620Reviewed-by: Hitoshi Yoshida <peria@chromium.org>
Reviewed-by: Yuki Shiino <yukishiino@chromium.org>
Reviewed-by: Kentaro Hara <haraken@chromium.org>
Commit-Queue: Marina Sakai <marinasakai@google.com>
Cr-Commit-Position: refs/heads/master@{#704047}