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This CL removes the last remaining traces of GA from files app.

It does not replace the remaining metrics that were being recorded
with UMAs, we're removing them as well as either:
a) There's coverage via an existing UMA, or
b) We don't care to record that metric anymore.

Bug: 847729
Change-Id: I602de642bac43df64f1ecd9035314d5019268aa8
Reviewed-on: https://chromium-review.googlesource.com/c/1347648Reviewed-by: Naoki Fukino <fukino@chromium.org>
Commit-Queue: Stuart Langley <slangley@chromium.org>
Cr-Commit-Position: refs/heads/master@{#610317}