DevTools: Chevron menu contains extra items when icons are enabled and docked to bottom.
DevTools: Chevron menu contains extra items when icons are enabled and docked to bottom.

The code that checks toolbar items fall into the second line was flaky.
It failed when item offset became 2px. Make it comparing the top offset to the
leftmost item height.

R=vsevik@chromium.org
BUG=231342

Review URL: https://codereview.chromium.org/14060008

git-svn-id: bf5cd6ccde378db821296732a091cfbcf5285fbd@148459 bbb929c8-8fbe-4397-9dbb-9b2b20218538

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