Oilpan: Add compile-time asserts that everything put in Member, WeakMember and Persistent is GarbageCollected.

This is done by checking that what is put in the pointer type

1. is a heap-allocated collection, or
2. is a subclass of garbage collected, or
3. is a garbage collected mixin where the user of the mixin is garbage collected.

This depends on Kouhei's change.

R=vegorov@chromium.org,haraken@chromium.org,kouhei@chromium.org

Review URL: https://codereview.chromium.org/181013006

git-svn-id: svn://svn.chromium.org/blink/trunk@168032 bbb929c8-8fbe-4397-9dbb-9b2b20218538