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Part of this is used as a bitmask, but in some cases we assume that the
core part is <= |PAGE_TRANSITION_LAST_CORE|.

See: https://cluster-fuzz.appspot.com/testcase?key=4815416552062976

R=tsepez@chromium.org

BUG=450268

Review URL: https://codereview.chromium.org/945973002

Cr-Commit-Position: refs/heads/master@{#317458}