app: use isARepeat method instead of ARepeat prop
app: use isARepeat method instead of ARepeat prop

The property was only introduced in 10.10, and doesn't offer us
anything more than what the method gives us.

Fixes golang/go#11827.

Change-Id: I5a9f9b068b9f18acc85a68a37dae11f19df686a1
Reviewed-on: https://go-review.googlesource.com/12552
Reviewed-by: Andrey Petrov <9a52d4e0deed20f4d033c8e20cc77f75fb6897da@gmail.com>
Reviewed-by: Hyang-Ah Hana Kim <d7e82c3c07f92613bcbf9a1e88f6b96c13caa3b0@gmail.com>

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