Revert of Change how the quota system computes the total poolsize for temporary storage

Seems to have negatively impacted quota allocation.

Original CL: https://codereview.chromium.org/1782053004/
Original Committed: https://crrev.com/db78e67f2c47c3b2e7bd548d9d1a4e4f1b3124e4
Original Cr-Commit-Position: refs/heads/master@{#438741}

BUG=520318,675875
R=cmumford@chromium.org
TBR=isherman@chromium.org

Review-Url: https://codereview.chromium.org/2592793002
Cr-Commit-Position: refs/heads/master@{#440079}
96 files changed