This is a fix for an issue of http://test-results.appspot.com/dashboards/flakiness_dashboard.html#showExpectations=true&showLargeExpectations=true&tests=calendar-picker problems. Calendar popups are shown below of date fields in some bots (expected), and are shown at the upper-left corder in some bots (wrong).
Created attachment 155206 [details] Patch
Landed: http://trac.webkit.org/changeset/124144