Makes Launcher remove itself as an observer from any windows it's

observing in its destructor.

BUG=none
TEST=none
R=ben@chromium.org

Review URL: http://codereview.chromium.org/8417002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@107612 0039d316-1c4b-4281-b951-d872f2087c98

ui/aura_shell/launcher/launcher.cc

@@ -43,6 +43,10 @@ Launcher::Launcher(aura::ToplevelWindowContainer* window_container)
 
 Launcher::~Launcher() {
   window_container_->RemoveObserver(this);
+  for (WindowMap::iterator i = known_windows_.begin();
+       i != known_windows_.end(); ++i) {
+    i->first->RemoveObserver(this);
+  }
 }
 
 void Launcher::MaybeAdd(aura::Window* window) {