Split termiante-during-sync-operation.html into three.

termiante-during-sync-operation.html was slow.  It sometimes took 89 seconds to
pass on debug bots.

BUG=357427

Review URL: https://codereview.chromium.org/293363014

git-svn-id: svn://svn.chromium.org/blink/trunk@174932 bbb929c8-8fbe-4397-9dbb-9b2b20218538