Do not allow to use OwnPtr for ref-counted types.

Check in compile time that type given to OwnPtr/PassOwnPtr is not inherited either from RefCountedBase or from ThreadSafeRefCountedBase.

Review URL: https://codereview.chromium.org/33013002

git-svn-id: svn://svn.chromium.org/blink/trunk@160375 bbb929c8-8fbe-4397-9dbb-9b2b20218538
Add use counters for the different BarProp properties

BUG=310691

Review URL: https://codereview.chromium.org/33173003

git-svn-id: svn://svn.chromium.org/blink/trunk@160376 bbb929c8-8fbe-4397-9dbb-9b2b20218538