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The level of the error signal after linear echo cancellation was based on non-buffered signal while that of the near-end and far-end signal based on buffered signal. This discrepancy made the comparison of them unfair. This CL is to make calculating the error level rely on the same buffering. BUG= Review URL: https://codereview.webrtc.org/1510873004 Cr-Commit-Position: refs/heads/master@{#11408}