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Reland note: Fixed version without NPE.

WebContentsStateBridge#createHistoricalTab() can be accomplished by
calling other methods:
- WebContentsStateBridge#restoreContentsFromByteBuffer()
- WebContentsStateBridge#createHistoricalTabFromContents()
- WebContents#destroy()

Replace it with these calls.

Bug: 1090048

Original change's description:
> Revert "Break down WebContentsStateBridge#createHistoricalTab()"
>
> This reverts commit 864ff6e1.
>
> Reason for revert: crbug.com/1100325
> TBR=dtrainor@chromium.org,jinsukkim@chromium.org,hnakashima@chromium.org
>
> # Not skipping CQ checks because original CL landed > 1 day ago.
>
> Bug: 1090048
> Change-Id: I73d490b12526ab8f26171f8c4fbf42fcbe284c17
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2273682
> Reviewed-by: Henrique Nakashima <hnakashima@chromium.org>
> Commit-Queue: Henrique Nakashima <hnakashima@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#783626}

TBR=dtrainor@chromium.org,jinsukkim@chromium.org,hnakashima@chromium.org


Bug: 1090048
Change-Id: Ie818a2ab7a9958d60cddac542151d7b0bc487b28
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2274200Reviewed-by: Jinsuk Kim <jinsukkim@chromium.org>
Reviewed-by: David Trainor <dtrainor@chromium.org>
Commit-Queue: Henrique Nakashima <hnakashima@chromium.org>
Cr-Commit-Position: refs/heads/master@{#784072}