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This change moves SystemSessionAnalyzer to its own subdirectory and
adds the Chrome Windows team as owners.

SystemSessionAnalyzer queries Windows' logged events, and is used by
StabilityMetricsProvider to determine whether an unclean shutdown of
the browser process was caused by system instability (rather than
Chrome instability). Because this file is only tangentially related to
the metrics service in components/metrics, it makes sense for it to be
owned by the Windows team rather than the broader metrics team.

Change-Id: I61f2ed168db418b6368051f41aea19d3912b25be
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2142135Reviewed-by: Ilya Sherman <isherman@chromium.org>
Reviewed-by: Sigurður Ásgeirsson <siggi@chromium.org>
Commit-Queue: Jesse McKenna <jessemckenna@google.com>
Cr-Commit-Position: refs/heads/master@{#757885}