[automerger skipped] Merge "Refactor puller of {Mobile|Wifi}BytesTransfer(ByFgBg)" into rvc-dev am: e6c5da62 am: 37706428 am: b9afb0d5 -s ours am: 087817d1 -s ours

am skip reason: Change-Id If544dd5a1dfc10bc70bf381f79a938f7d6b1dcb7 with SHA-1 9f0146a5 is in history

Change-Id: I40ba6175b3da75428ec197b5b69d51602786e5aa