fix(synchronizing): use the same control flow when ignoring sync
fix(synchronizing): use the same control flow when ignoring sync

Previously, the order of frames and tasks on the control flow was
different depending on `browser.ignoreSynchronization`. This fixes
the inconsistency by creating an empty task when ignoreSynchronization
is true.

Practically, this fixes the polling spec failing after the update
to selenium-webdriver@2.47.0.

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