Fix content_script don't send init request to background
Add FlashElement::parent var & use
Fix observer remove on blocking flash element
Undo commit @2b019e8 & suite + Make BackgroundFlashData::data an Array of Objects & use + Small fix + Fix BackgroundFlashData::clear() use old definition of ::contentPort
Fix data is clear with non main frame + Fix BackgroundFlashData::setData() push data unless concat