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After introducing the App instance, --install is broken on Windows.
* pv is not handled correctly and it is not clear if this ever worked at
all, even before refactoring.
* the splash screen object has an incorrect life time.
* the prefs are not save correctly due to threading and run loop issues.

Bug: 1059135
Change-Id: I3a5930dcdbf530b0229692722734cb05680d63aa
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2090973Reviewed-by: Joshua Pawlicki <waffles@chromium.org>
Commit-Queue: Sorin Jianu <sorin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#747698}