The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/13fbda637196d8a45059840cfd285cd7c3d85124

commit 13fbda637196d8a45059840cfd285cd7c3d85124
Author: msw <msw@chromium.org>
Date: Sat Feb 18 17:00:21 2017

Replace WmWindowObserver with aura::WindowObserver.

Also, some cleanup, mostly around ShelfWindowWatcher:
-Convert most ShelfWindowWatcher WmWindow use to aura::Window.
-Use aura::client::ActivationChangeObserver in ShelfWindowWatcher.
-Persist mash default shelf item type (app) workaround from WmWindow.

BUG= 687654 
TEST=No behavior changes
R=sky@chromium.org

Review-Url: https://codereview.chromium.org/2699033002
Cr-Commit-Position: refs/heads/master@{#451467}

[modify] https://crrev.com/13fbda637196d8a45059840cfd285cd7c3d85124/ash/BUILD.gn
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[modify] https://crrev.com/13fbda637196d8a45059840cfd285cd7c3d85124/ash/common/wm/workspace_controller.cc
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[delete] https://crrev.com/98a1e01f4f58d073314620488e4563bb1cfee39d/ash/common/wm_window_observer.h
[delete] https://crrev.com/98a1e01f4f58d073314620488e4563bb1cfee39d/ash/common/wm_window_tracker.h
[modify] https://crrev.com/13fbda637196d8a45059840cfd285cd7c3d85124/ash/common/wm_window_unittest.cc
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[modify] https://crrev.com/13fbda637196d8a45059840cfd285cd7c3d85124/ash/root_window_controller.cc
[modify] https://crrev.com/13fbda637196d8a45059840cfd285cd7c3d85124/ash/shelf/shelf_window_targeter.cc
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