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In some cases the user could end up with a disk larger than we allow
them to have. When that happens they can still go up to their current
size instead of us erroring out.

Bug: chromium:1083847
Test: Unit
Change-Id: If55591bfbf8d7c81c1aea27db9dc06a54ea0988f
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2208157
Auto-Submit: David Munro <davidmunro@google.com>
Commit-Queue: Nicholas Verne <nverne@chromium.org>
Reviewed-by: Nicholas Verne <nverne@chromium.org>
Cr-Commit-Position: refs/heads/master@{#770018}