Get the rest of the ash_unittests to pass with the new FocusController (!)

Ash changes:

. Active RootWindow as tracked by the shell must only be updated when activation isn't being cleared.
. AshFocusRules' method that locates the next window to activate now searches forward and backward from the destroyed window's container. It used to only search forward.
. Some tests test for conditions that are no longer valid with the new focus controller, so we put some conditionals into the tests (PanelLayoutManagerTest and WindowManagerTest).
. ToplevelWindowEventFilterTest had an incomplete ash environment that wasn't getting all the right logic, so changed it to use full-ash.
. BubbleDelegateView needs to remove its observer to avoid a crash.

Core logic changes:

. A window must be focusable for it to be activatable. For some reason this test had eluded earlier incarnations.
. GetActivatableWindow() needs to be able to jump to a modal transient if one is present.
. GetFocusableWindow() needs to be able to hop to the next activatable window if the specified window isn't activatable.
. Prevent recursion in processing focus/activation changes.
. Prevent changing focus to the parent window when a child is focused.

R=sky@chromium.org
http://crbug.com/162100
Review URL: https://codereview.chromium.org/11519040

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@173011 0039d316-1c4b-4281-b951-d872f2087c98

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