Bug 1009809 - Use ManifestHelper::biggestIconURL in the desktop app installer. r=myk,jmaher

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rename : toolkit/webapps/tests/test_hosted.xul => toolkit/webapps/tests/test_hosted_icons.xul
rename : toolkit/webapps/tests/test_packaged.xul => toolkit/webapps/tests/test_packaged_icons.xul