Web Inspector: popover is not shown for detached DOM nodes, not referenced directly...

Web Inspector: popover is not shown for detached DOM nodes, not referenced directly from JS
https://bugs.webkit.org/show_bug.cgi?id=89955

Reviewed by Vsevolod Vlasov.

Show object popover for all heap snapshot nodes event for those whose
canBeQueried flag is false. We didn't show popover for such objects before
as it could lead to the backend crash. In the meantime the backend shouldn't
fail on such DOM wrappers and report an error if it cannot resolve
inspected object.

* inspector/front-end/HeapSnapshotGridNodes.js:
(WebInspector.HeapSnapshotGenericObjectNode):
(WebInspector.HeapSnapshotGenericObjectNode.prototype.get data):
* inspector/front-end/HeapSnapshotView.js:
(WebInspector.HeapSnapshotView.prototype._getHoverAnchor):

git-svn-id: http://svn.webkit.org/repository/webkit/trunk@121256 268f45cc-cd09-0410-ab3c-d52691b4dbfc