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This CL removes the |selected_tab_index| argument from
SessionRestoreImpl::RestoreTabsToBrowser(). The argument was useless
since the selected tab index could simply be retrieved from the
SessionWindow.

Also interesting, SessionRestoreImpl::ProcessSessionWindow() passed
the index of the currently active tab to
SessionRestoreImpl::RestoreTabsToBrowser() when the initial tab
count was zero. This was strange, but had no impact since
SessionRestoreImpl::RestoreTabsToBrowser() did nothing with the value
when the initial tab count was non-zero.

Change-Id: I9a8e4dce2044495a3257dd14b63e1dc3a52c6643
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1894466Reviewed-by: Scott Violet <sky@chromium.org>
Commit-Queue: François Doray <fdoray@chromium.org>
Cr-Commit-Position: refs/heads/master@{#713449}