Bug 982800 - Browser API: Add a mozbrowsermanifestchange event to detect <link rel="manifest"> elements, r=ehsan

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rename : dom/browser-element/mochitest/test_browserElement_inproc_Iconchange.html => dom/browser-element/mochitest/test_browserElement_inproc_Manifestchange.html
rename : dom/browser-element/mochitest/test_browserElement_oop_Iconchange.html => dom/browser-element/mochitest/test_browserElement_oop_Manifestchange.html