Fix window.history GC issue.  Since the history object is not part of
the DOM, we need to explicitly keep the history wrapper object alive
for the lifetime of the DOMWindow object with which it is associated.
Review URL: http://codereview.chromium.org/53092

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@12543 0039d316-1c4b-4281-b951-d872f2087c98
3 files changed