When an extension is uninstalled, close all desktop notifications from that extension.

This change also refactors the balloon collection code to remove duplication between chrome and chromeos.

Removes some gross removal code which was using fake notifications just to get the right ID.

BUG=58266
TEST=open notifications from extension, uninstall extensions


Committed: http://src.chromium.org/viewvc/chrome?view=rev&revision=65879

Committed: http://src.chromium.org/viewvc/chrome?view=rev&revision=66571
Review URL: http://codereview.chromium.org/4635007

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@66829 0039d316-1c4b-4281-b951-d872f2087c98
34 files changed