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This mostly reverts the commit, "Adds user setting to allow speech to
continue after text goes away." (commit 80d1057b)

However, the private variable readAfterClose_ was kept in order to by default
keep reading, but make it easy to change this functionality later.

After UI review, it was determined that the setting is unnecessary. We will just
always speak after text goes away. This may be confusing for novice users but
should get better once we have the on-screen UI.

Bug: 818835
Cq-Include-Trybots: master.tryserver.chromium.linux:closure_compilation
Change-Id: I04a36b717251ef88283570a690e42366c035dded
Reviewed-on: https://chromium-review.googlesource.com/967241Reviewed-by: Dominic Mazzoni <dmazzoni@chromium.org>
Commit-Queue: Katie Dektar <katie@chromium.org>
Cr-Commit-Position: refs/heads/master@{#544094}