Reland "[mojo] Remove DocumentInterfaceBroker"

This is a reland of 3e01d61b6274c4c9d6580f964291c2a5de97a733

Removed the remaining #include for frame_host_test_interface.mojom.h

Original change's description:
> [mojo] Remove DocumentInterfaceBroker
>
> This change removes the DocumentInterfaceBroker mojom interface and all
> related plumbing. No functional changes since the interface was not used
> by anything (clients migrated to BrowserInterfaceBroker).
>
> [email protected],[email protected],[email protected],[email protected],[email protected],[email protected],[email protected]
>
> Bug: 985120
> Change-Id: I893f940bc2c5d237aac5fb6b3962c06bfa98e938
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1881394
> Reviewed-by: Oksana Zhuravlova <[email protected]>
> Reviewed-by: Tommy Li <[email protected]>
> Reviewed-by: Devlin <[email protected]>
> Reviewed-by: Alex Moshchuk <[email protected]>
> Reviewed-by: Kentaro Hara <[email protected]>
> Reviewed-by: Chrome Cunningham <[email protected]>
> Reviewed-by: Daniel Cheng <[email protected]>
> Reviewed-by: Arthur Sonzogni <[email protected]>
> Reviewed-by: Rebekah Potter <[email protected]>
> Commit-Queue: Oksana Zhuravlova <[email protected]>
> Cr-Commit-Position: refs/heads/master@{#713278}

Bug: 985120
Change-Id: If3a080592aef38d0c143f6a0d150991c091a4b6d

[email protected],[email protected],[email protected],[email protected],[email protected],[email protected],[email protected]

Change-Id: If3a080592aef38d0c143f6a0d150991c091a4b6d
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1903007
Reviewed-by: Daniel Cheng <[email protected]>
Reviewed-by: Chrome Cunningham <[email protected]>
Commit-Queue: Oksana Zhuravlova <[email protected]>
Cr-Commit-Position: refs/heads/master@{#713528}
87 files changed