Bug 897848 - Profiler should use { showArrows: true } when initializing the SideMenuWidget; r=vporof

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extra : amend_source : 1545801ced057c7238c582aa6b5480debc3694b4
Bug 897849 - Debugger should use { showArrows: true } when initializing the SideMenuWidget; r=vporof
Bug 897777 - fix source mapped source resolution when there is no source root; r=jimb
Bug 897777 - fix source mapped source resolution when there is no source root; r=jimb
Merge fx-team