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ClientUsageTracker::GetGlobalLimitedUsage() has a bug, exposed by the
tests in https://crrev.com/c/2288502/1. Fortunately, it is only used to
implement UsageTracker::GetGlobalLimitedUsage(), which is only used in
tests.

This CL removes the unused code, and adds UsageTracker unit tests to
prevent bugs similar to the one discovered in GetGlobalLimitedUsage().

Bug: 1103426
Change-Id: Ifb44dbce66579ea9afc420fce0ee2482cafa127d
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2288502
Commit-Queue: Victor Costan <pwnall@chromium.org>
Reviewed-by: Marijn Kruisselbrink <mek@chromium.org>
Cr-Commit-Position: refs/heads/master@{#786597}