Gardening. More infrequent clearLayoutRootIfNeeded crashes.
Gardening. More infrequent clearLayoutRootIfNeeded crashes.

BUG=238363
TBR=zmo@chromium.org
NOTRY=true

Review URL: https://chromiumcodereview.appspot.com/15001025

git-svn-id: bf5cd6ccde378db821296732a091cfbcf5285fbd@150063 bbb929c8-8fbe-4397-9dbb-9b2b20218538

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