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Chrome doesn't use overlay scrollbars. The only thing that we do with this
library is attempt to initialize it (as part of gtk2+ init) which occasionally
tries to read a missing settings schema and crashes.

BUG=456205
TBR=glider@chromium.org
NOTRY=true

Review URL: https://codereview.chromium.org/905703003

Cr-Commit-Position: refs/heads/master@{#315361}