Bug 1024614 - Guard against null resolver when flushing DNS cache r=sworkman

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extra : histedit_source : 028f9b336a9da0ede7fec22afc4cabd00b86222f
Bug 1024614 - Send network link change events on Android r=blassey,mcmanus

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extra : histedit_source : eb8916c6322cf8f858a63a9df252ffae041b275a