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This CL makes MediaNotificationView notify its container when the
header is clicked. This allows GMC's MediaNotificationContainerImplView
to handle header clicks as if the container itself was clicked (which
is fine since clicking the header on GMC has no effect since we hide
the expand button).

This fixes an issue where if the user clicked on the header (which is
visually indistinguishable from the rest of the notification) then we
would not go back to tab.

Bug: 1020300
Change-Id: I7640b4d268871f2fe49c87c3b174f4a49e716500
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1894190Reviewed-by: James Cook <jamescook@chromium.org>
Reviewed-by: Jazz Xu <jazzhsu@chromium.org>
Commit-Queue: Tommy Steimel <steimel@chromium.org>
Cr-Commit-Position: refs/heads/master@{#711425}