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This is a reland of 38b34519

There are no changes in this reland. The fix is in:
https://crrev.com/i/2566200/3

This is part of a 2-sided patch which will be submitted just
before the above change.

Original change's description:
> Move entity and property mojo types to //components.
>
> We will use these types from both blink and //content and from code
> inside //components.
>
> This patch affects Clank downstream and will be submitted together with
> a patch in that repo to avoid breakage. Clank CL:
> https://crrev.com/i/2545991
>
> See discussion in design doc:
> https://docs.google.com/document/d/1ZA-1EMq4d40K5qfsZoeMIhJmZA6-AXaSibD3SsqZjfU/edit#
>
> Bug: 1044252
> Change-Id: Id658caa422bedbcb6d2275a8ccdd76f73bf955c8
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2051363
> Reviewed-by: Kinuko Yasuda <kinuko@chromium.org>
> Reviewed-by: Kentaro Hara <haraken@chromium.org>
> Reviewed-by: Becca Hughes <beccahughes@chromium.org>
> Commit-Queue: Sam Bowen <sgbowen@google.com>
> Cr-Commit-Position: refs/heads/master@{#741227}

TBR=beccahughes@google.com,haraken@chromium.org

Bug: 1044252
Change-Id: Ib37ff0cfa3913fa1c7c4dc7a956c8efff04b0b17
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2057740
Commit-Queue: Sam Bowen <sgbowen@google.com>
Reviewed-by: Kinuko Yasuda <kinuko@chromium.org>
Cr-Commit-Position: refs/heads/master@{#742283}