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This reverts commit e19fa28d.

Reason for revert: Cause of https://crbug.com/903402

Original change's description:
> Marks the document object as busy while it is still loading
> 
> Screen readers want to have a reliable way to know whether a document is still loading so as to ignore events coming from it.
> The current change can be made irrespective to whether we will mark the document as loaded when HTML parsing has started or when the "interactive" readyState has been entered.
> 
> R=​dmazzoni@chromium.org, aleventhal@chromium.org
> 
> Bug: 897177
> Change-Id: I5d734ff9d32c53b7ba12a6d5d4eeb74b26ba0a02
> Reviewed-on: https://chromium-review.googlesource.com/c/1295769
> Commit-Queue: Nektarios Paisios <nektar@chromium.org>
> Reviewed-by: Dominic Mazzoni <dmazzoni@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#606147}

TBR=dmazzoni@chromium.org,nektar@chromium.org,aleventhal@chromium.org

# Not skipping CQ checks because original CL landed > 1 day ago.

Bug: 897177
Change-Id: Ib13f772ecf7fe300afbb48e16952f65bf0d0728a
Reviewed-on: https://chromium-review.googlesource.com/c/1327721Reviewed-by: Brian Sheedy <bsheedy@chromium.org>
Commit-Queue: Brian Sheedy <bsheedy@chromium.org>
Cr-Commit-Position: refs/heads/master@{#606658}