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When a shell window was closed, it wasn't removed from the registry immediately
(it was removed in a callback from OnNativeClose, which happens a bit later.)
This meant that when the app was loaded again, the window was still in the
registry with a stale pointer to the old extension. ExtensionSettingsHandler
was tickling this by iterating shell windows on extension load.

BUG=174250


Review URL: https://chromiumcodereview.appspot.com/12210107

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@182194 0039d316-1c4b-4281-b951-d872f2087c98