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This reverts commit d5f58580.

Reason for revert: A CL this depends on got reverted

Original change's description:
> [WebLayer] Create FragmentHostingRemoteFragmentImpl
>
> This CL removes the fake FragmentActivity from SiteSettingsFragmentImpl
> and MediaRouteDialogFragmentImpl, replacing them with a Context that
> hosts the fragments instead. This is possible now that we've landed
> the bytecode rewriting that changes the return type of
> Fragment.getActivity() from FragmentActivity to Activity.
>
> Bug: 1123216
> Change-Id: I98c2c07eb348d6833ca2e5d976110f7f29b5359e
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2523751
> Commit-Queue: Robbie McElrath <rmcelrath@chromium.org>
> Reviewed-by: Evan Stade <estade@chromium.org>
> Reviewed-by: Scott Violet <sky@chromium.org>
> Reviewed-by: Finnur Thorarinsson <finnur@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#828649}

TBR=sky@chromium.org,finnur@chromium.org,estade@chromium.org,rmcelrath@chromium.org

Change-Id: I2b83becfef2a92bd878bf32ae3aa5b750853a752
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: 1123216
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2547783Reviewed-by: Robbie McElrath <rmcelrath@chromium.org>
Commit-Queue: Robbie McElrath <rmcelrath@chromium.org>
Cr-Commit-Position: refs/heads/master@{#828839}