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In Blender 2.79, dragging your mouse in the middle of the frame would scrub through frames. Now in 2.78 it does a box select. In order to scrub through frames again I must drag my mouse across the frame numbers at the top.
How can I switch the frame scrubbing back to what it was like in 2.79?
As commented, the default setup in 2.80 is to use ⇧ Shift
RMB in the middle of the animation related editors to change the current frame.
If you want to change this, you can adjust the keymap settings in the User Preferences.
You can find the frame change under animation.
And the selection settings are under Dopesheet -> Dopesheet(Global)
By changing the selection settings to use ⇧ Shift RMB and the frame change to use 
LMB you can continue working the way you remember.
