Revert 119976 - Adds two new observer methods to allow code to be notified when a Window is added/removed from a RootWindow. This allows hierarchy-specific cleanup code to execute when a Window is removed rather than when it is destroyed, necessary for multiple root windows.

http://crbug.com/112131
TEST=see unittests
Review URL: https://chromiumcodereview.appspot.com/9315015

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Review URL: https://chromiumcodereview.appspot.com/9315017

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@119986 0039d316-1c4b-4281-b951-d872f2087c98
6 files changed