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Per the IndexedDB specification, a versionchange transaction is running
until the open request's transaction member is set to null, which
should happen (synchronously) after the onabort() event handler is
called. Therefore, tests can only assume that a transaction stopped
running after the onabort event handler has occurred.

BUG=657968

Review-Url: https://codereview.chromium.org/2538343002
Cr-Commit-Position: refs/heads/master@{#437974}