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Rather than using ObjectTemplateBuilder::SetProperty() on GinPort, use
ObjectTemplateBuilder::SetLazyDataProperty(). This allows author script
to reset the properties to be something else, which is more inline with
the majority of JS objects exposed to scripts.

Add tests for the same.

Bug: 927887
Change-Id: I8f983918014d69941992423eece5fd1eed9c58e0
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1506771Reviewed-by: Jeremy Roman <jbroman@chromium.org>
Commit-Queue: Devlin <rdevlin.cronin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#638592}