Revert "win: Make chrome.7z generation more deterministic."

This reverts commit e2a95639125afd08739a36d0e7f367f7b8abb952.

Reason for revert: This breaks tests on account of fooling the Windows loader. See https://bugs.chromium.org/p/chromium/issues/detail?id=900121#c6 for details.

Original change's description:
> win: Make chrome.7z generation more deterministic.
> 
> mini_installer.exe embeds chrome.7z, and chrome.7z contains timestamps
> of all files in the archive. To make chrome.7z more deterministic, give
> all files in it deterministic timestamps.
> 
> Bug: 330260
> Change-Id: Ia251dd38177acbebdde288b86826986f441b2d4d
> Reviewed-on: https://chromium-review.googlesource.com/c/1302393
> Reviewed-by: Gabriel Charette <gab@chromium.org>
> Commit-Queue: Nico Weber <thakis@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#603171}

TBR=gab@chromium.org,thakis@chromium.org

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

Bug: 330260
Change-Id: I261401c27226ab9e0cf30bc07a47ecf8399f491b
Reviewed-on: https://chromium-review.googlesource.com/c/1317569
Reviewed-by: Greg Thompson <grt@chromium.org>
Commit-Queue: Greg Thompson <grt@chromium.org>
Cr-Commit-Position: refs/heads/master@{#605299}
3 files changed