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The code to deal with multi-window enabled/disabled was duplicated in
CrashRestoreHelper where calling the multi-window enabled code with a
session with an empty name was the same as calling code for single
window. Refactor the code to avoid the duplication.

Change the backup directory used for the saved session when restore
is in progress as the single directory approach would not work with
multi-profile.

Bug: 1165798
Change-Id: Ifa6efe051999b77688a8a6ffdb8b9ed3b185e60e
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2632677
Commit-Queue: Sylvain Defresne <sdefresne@chromium.org>
Reviewed-by: Stepan Khapugin <stkhapugin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#845174}