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Change stream type to CRAS_CLIENT_TYPE_LACROS for lacros-chrome.
The stream type is used while recording UMA logs in CRAS. So we can
separate data between ash-chrome and lacros-chrome.

BUG=b:167941044

Change-Id: I35a8320bd9b5d372d9f5ac883078d010ed42ee9e
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2521473Reviewed-by: Dale Curtis <dalecurtis@chromium.org>
Commit-Queue: Yu-Hsuan Hsu <yuhsuan@chromium.org>
Cr-Commit-Position: refs/heads/master@{#825720}