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This reverts commit f0f5ad44.

Reason for revert: Tentative revert for suspect of BackForwardCachePrintBrowserTest.DisableCaching failure; see https://crbug.com/1115515

If this does not resolve the issue, I will reland the CL (with apologies! :))

Original change's description:
> Narrow the scope of page pause when printing.
> 
> In the current implementation, sometimes the scope of a page's "pause"
> is too wide compared to the definition in the spec [1], and sometimes it
> does not pause at all. So narrow the scope to better conform to the
> spec, and apply it consistently to all possible ways users can print.
> 
> This is based on an earlier CL [2] which only did this for printing with
> the system dialog, but not for Print Preview. Some of the trickier cases
> handled, which require unpausing, are:
> - Navigations while previewing.
> - Printing selections, which require a navigation.
> 
> [1] https://html.spec.whatwg.org/C/#printing-steps
> [2] https://crrev.com/c/1669250
> 
> Bug: 956832
> Change-Id: I9bf274fcfb70eefe896fbbae9ce13a88b6f4dfc0
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2338819
> Reviewed-by: Yuki Shiino <yukishiino@chromium.org>
> Reviewed-by: Kent Tamura <tkent@chromium.org>
> Commit-Queue: Lei Zhang <thestig@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#797120}

TBR=thestig@chromium.org,yukishiino@chromium.org,tkent@chromium.org

Change-Id: I3518cb22f1b19fb4a2942c46fbcd9e7326d20863
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: 956832, 1115515
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2352430Reviewed-by: Stephen McGruer <smcgruer@chromium.org>
Commit-Queue: Stephen McGruer <smcgruer@chromium.org>
Cr-Commit-Position: refs/heads/master@{#797234}