https://bugs.webkit.org/show_bug.cgi?id=87589

Patch by Arvid Nilsson <anilsson@rim.com> on 2012-05-27
Reviewed by Rob Buis.

The WebPageCompositorPrivate is reference counted, so it may outlive
either the WebPage or the WebPageCompositor, depending on who releases
its reference first.

Fixed by disconnecting the objects properly, regardless of who goes
away first.

Reviewed internally by Mike Lattanzio.

PR #156444

* Api/WebPage.cpp:
(BlackBerry::WebKit::WebPagePrivate::setCompositor):
(BlackBerry::WebKit::WebPagePrivate::destroyCompositor):
* Api/WebPageCompositor.cpp:
(BlackBerry::WebKit::WebPageCompositor::~WebPageCompositor):
(BlackBerry::WebKit::WebPageCompositor::client):
* Api/WebPageCompositor_p.h:
(BlackBerry::WebKit::WebPageCompositorPrivate::setPage):

git-svn-id: http://svn.webkit.org/repository/webkit/trunk@118627 268f45cc-cd09-0410-ab3c-d52691b4dbfc