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Re-enable HotseatShelfAppBrowserTest.TappingAppIconsHidesHotseat. Fix
one things: In ShelfWidget, contextual nudge related function should
not be called when the contextual nudge feature is disabled.

Verify this CL with MSAN test.

Bug: 1021011
Change-Id: Iff1755001e41e28cfe0490e014502ad711e0b90c
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2207613
Commit-Queue: Andrew Xu <andrewxu@chromium.org>
Reviewed-by: Xiyuan Xia <xiyuan@chromium.org>
Cr-Commit-Position: refs/heads/master@{#772081}