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LoggingHandler's buffer is redundant,
since it's already using the batching feature.
LoggingHandler.flush previously just flushes its own buffer
and put messages in the batcher's buffer,
without necessarily making RPC calls.
This PR does not fix this problem,
but it makes flush obviously wrong instead of subtly.
The test for flush size is also removed.
Flush size should be forwareded to the batcher,
which already has its own test.
Updates #1795.