If you have too many bytes of untracked+ignored data in your repo then
gclient sync will fail, confidently telling you how many bytes of this
type you have. The problem is, it lies. It reports the level as soon as
it is exceeded, even though it has not finished totaling up the file
sizes. This change makes the reporting accurate.

I noticed this problem because "gclient sync" told me I had 1049.9 MB
of untracked data. I deleted some and it then said I had 1563.9 MB of
untracked data. Hmmm.

Bug: 376099
Change-Id: I797a4279ad666d83c4a5fbd54bdf7ddbf0e7ad84
Reviewed-on: https://chromium-review.googlesource.com/850854
Commit-Queue: Bruce Dawson <brucedawson@chromium.org>
Reviewed-by: Aaron Gable <agable@chromium.org>