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Fix another two tests which are broken with the flag enabled:
(1) ShelfTooltipManagerTest.HideForEvents: The event generator fails
to reset the mouse button.
(2) ShelfWidgetTest.LauncherInitiallySized: It assumes that the
shelf widget's bounds are identical with the bounds of the shelf view.
However, it is incorrect with the scrollable shelf enabled.

Bug: 1002576
Change-Id: Ia573eef66a25b73e45b9b69e0e435320b2f07eca
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1808459
Commit-Queue: Andrew Xu <andrewxu@chromium.org>
Reviewed-by: Manu Cornet <manucornet@chromium.org>
Cr-Commit-Position: refs/heads/master@{#697336}