Bug 974460 - Add translation icon to URL bar structure, r=felipe.

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extra : rebase_source : 0f91743c05b89d766686dbb2998ca5a6726746a1
Bug 991202 - The event callback of popup notifications should have a way to prevent the panel from showing, r=felipe.

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extra : rebase_source : 3005a199a081d8cc9aa803c0f7d6e426d8af03a0
Bug 974461 - Display translation icon at the same time as the translation infobar, r=felipe.

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extra : rebase_source : a00d5c02ba42c66de943d9c4c34171f3f35022ed