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When the mouse is at the top of the screen in fullscreen and the toolbar
is visible, the toolbar slides down to make room for the menu bar. The
offset was calculated in GetBoundsForTabStrip(), which only affects some
of of layout. This change moves it to GetTopInset().

Bug: 865901
Change-Id: I5de02ac951f8347aeadc4af7238ea8f9172edc68
Reviewed-on: https://chromium-review.googlesource.com/1147477Reviewed-by: Elly Fong-Jones <ellyjones@chromium.org>
Commit-Queue: Sidney San Martín <sdy@chromium.org>
Cr-Commit-Position: refs/heads/master@{#577503}