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As is said in the bug, we decided not to show the title in the
title bar for ARC apps. However, debugging information (stored
in extra_title_) wants to appear, and the overview mode wants
to show the actual title (app name) instead of the debugging
information.

So this CL changed ClientControlledShellSurface as:
- GetWindowTitle always return extra_title_ and no title_ so
  title won't appear anymore
- when the widget's title is updated, directly specify the
  native window's title which is used by the overview mode

Bug: 831383
Test: manually, exo_unittests
Change-Id: Ifa275bd6f5c72b8ca36cccf7f9c629498c4a670e
Reviewed-on: https://chromium-review.googlesource.com/1012783
Commit-Queue: Jun Mukai <mukai@chromium.org>
Reviewed-by: Mitsuru Oshima <oshima@chromium.org>
Reviewed-by: David Reveman <reveman@chromium.org>
Cr-Commit-Position: refs/heads/master@{#551529}