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As I assumed, it's a namespace problem. Your observation_sources parameter is defined outside of the corresponding namespace of the layer plugin.
Change this...
observation_sources: laser
to this:
obstacle_layer:
observation_sources: laser
... assuming that your launch file sets the correct namespace for the load parameter of the move_base node (like in the move_base tutorial).
Generally speaking, imho this should be explicitly mentioned somewhere in the Groovy->Hydro migration tutorial for move_base and costmap_2d since I ran into the very same problem and I guess @CarolineQ and me are not the only ROS noobs who make this experience.
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