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We should notify SessionManager before we actually create a new browser
window. This is needed to cover one of the bugs related to the splash
screen.

Bug: 1006230, 939674
Change-Id: I3e7e8b5b639dd1bfec2483869959a50b0acb2053
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1912360Reviewed-by: Xiyuan Xia <xiyuan@chromium.org>
Reviewed-by: Peter Kasting <pkasting@chromium.org>
Commit-Queue: Anatoliy Potapchuk <apotapchuk@chromium.org>
Cr-Commit-Position: refs/heads/master@{#715675}