Bug 1111727 - Make sure mozrunner's command line interface uses the proper profile class, r=whimboo

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extra : rebase_source : 46c97f32314078f71808bd5083df159060f6f4d7
Bug 1111727 - Bump mozrunner to version 6.7, r=whimboo

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extra : rebase_source : 34854203ebbc8b2339de54f83d29e381f718208a