That should prevent leak of objects when page is reloaded.

BUG=chromium:906847

Change-Id: I90928a5c4979c0ddc01c201bf60a693e2b03863a
Reviewed-on: https://chromium-review.googlesource.com/c/1366449
Commit-Queue: Alexei Filippov <alph@chromium.org>
Reviewed-by: Dmitry Gozman <dgozman@chromium.org>
Cr-Commit-Position: refs/heads/master@{#58110}