This is a reland of 18d0d7f6
without any changes. This used to break the custom snapshot build but
the bug seems to be fixed elsewhere.

Original change's description:
> Ship Symbol.prototype.description
>
> Intent to ship:
> https://groups.google.com/forum/#!msg/v8-users/9U2kEQw8pb8/Sn91yUx5BQAJ
>
> Bug: v8:7807
> Cq-Include-Trybots: luci.chromium.try:linux_chromium_headless_rel;master.tryserver.blink:linux_trusty_blink_rel
> Change-Id: Ia9e73495b08b432371dfb0ccc571af969ae4d59f
> Reviewed-on: https://chromium-review.googlesource.com/1107210
> Commit-Queue: Joyee Cheung <joyee@igalia.com>
> Commit-Queue: Sathya Gunasekaran <gsathya@chromium.org>
> Reviewed-by: Sathya Gunasekaran <gsathya@chromium.org>
> Reviewed-by: Aleksey Kozyatinskiy <kozyatinskiy@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#53933}

Bug: v8:7807
Cq-Include-Trybots: luci.chromium.try:linux_chromium_headless_rel;master.tryserver.blink:linux_trusty_blink_rel
Change-Id: I1225b9c8619c1a628149c9b54058798aab93a2a8
Reviewed-on: https://chromium-review.googlesource.com/1131156
Commit-Queue: Sathya Gunasekaran <gsathya@chromium.org>
Reviewed-by: Yang Guo <yangguo@chromium.org>
Reviewed-by: Aleksey Kozyatinskiy <kozyatinskiy@chromium.org>
Reviewed-by: Sathya Gunasekaran <gsathya@chromium.org>
Cr-Commit-Position: refs/heads/master@{#54691}