Oilpan: move NavigationScheduler's redirect actions onto the heap.

As NavigationScheduler is attached to a LocalFrame, arrange for its
ScheduledNavigation actions to be on the Oilpan heap also, so that
any of its traceable references are accurately accounted for.

R=peria,haraken
BUG=340522

Review URL: https://codereview.chromium.org/1133303007

git-svn-id: svn://svn.chromium.org/blink/trunk@195342 bbb929c8-8fbe-4397-9dbb-9b2b20218538
2 files changed