app: remove Callbacks and Run
app: remove Callbacks and Run

It has to go sometime.

Fixes golang/go#10896.

Change-Id: I2ac1437e1d5913c09060931454bf11c3f742ef87
Reviewed-on: https://go-review.googlesource.com/12337
Reviewed-by: Hyang-Ah Hana Kim <d7e82c3c07f92613bcbf9a1e88f6b96c13caa3b0@gmail.com>

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