Updated EchoCanceller UMA metrics expiration dates

This CL postpones the expiration dates for some of the echo canceller
UMA metrics.

Bug: webrtc:8671
Change-Id: Ibab1da1b14bac0620fec2a821d7502a3c557682c
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1680460
Reviewed-by: Nik Bhagat <nikunjb@chromium.org>
Commit-Queue: Per Åhgren <peah@chromium.org>
Cr-Commit-Position: refs/heads/master@{#673246}
1 file changed