Oilpan: add assert to verify eager finalization.
Oilpan: add assert to verify eager finalization.

A class annotated with EAGERLY_FINALIZE() is dependent on having
an 'operator new' overload that takes eagerness correctly into
account. The use of a EAGERLY_FINALIZE() declaration does not
guarantee this, so add an assert to catch classes not correctly
handled.

R=haraken
BUG=491488

Review URL: https://codereview.chromium.org/1166793002

git-svn-id: bf5cd6ccde378db821296732a091cfbcf5285fbd@196404 bbb929c8-8fbe-4397-9dbb-9b2b20218538

axinging/chromium-crosswalk,axinging/chromium-crosswalk,axinging/chromium-crosswalk,axinging/chromium-crosswalk,axinging/chromium-crosswalk,axinging/chromium-crosswalk,axinging/chromium-crosswalk,axinging/chromium-crosswalk,axinging/chromium-crosswalk,axinging/chromium-crosswalk,axinging/chromium-crosswalk