Revert a small change to how ViewManagerClientImpl sends notifications.

In 8b0dc8a1c, as part of an unrelated cleanup, I made the observer list
only notify the focus/activated observers. This meant that the observers
of the unfocused/deactivated View never got notified. This reverts that
change.

BUG=none
R=sky@chromium.org

Review URL: https://codereview.chromium.org/805973003