Web Inspector: Uncaught Exception: NavigationSidebarPanel.js: TypeError: undefined is not a function
https://bugs.webkit.org/show_bug.cgi?id=126018

Patch by Joseph Pecoraro <pecoraro@apple.com> on 2013-12-19
Reviewed by Timothy Hatcher.

ERROR: TypeError: undefined is not a function (evaluating 'representedObject.saveIdentityToCookie(candidateObjectCookie)')

There are some TreeElements (Folders, and the special Databases Folder)
which do not have a represented object, and would throw an exception
when trying to use saveIdentityToCookie.

We should always provide a saveIdentityToCookie when possible. So just
blacklist the tree element types we know do not have representedObjects,
and where we don't want to save identity. This will continue to throw
exceptions in the future for tree elements that don't have the save
function implemented, but should.

Note that even if a TreeElement is constructed with a null represented
object, it becomes an empty object (representedObject || {}).

* UserInterface/NavigationSidebarPanel.js:
(WebInspector.NavigationSidebarPanel.prototype.saveStateToCookie):
(WebInspector.NavigationSidebarPanel.prototype._isTreeElementWithoutRepresentedObject):
(WebInspector.NavigationSidebarPanel.prototype.treeElementMatchesCookie):
(WebInspector.NavigationSidebarPanel.prototype._checkElementsForPendingViewStateCookie):

git-svn-id: http://svn.webkit.org/repository/webkit/trunk@160888 268f45cc-cd09-0410-ab3c-d52691b4dbfc