Don't delete the current NavigationEntry when leaving an interstitial page.

BUG=107182
TEST=See bug

Review URL: http://codereview.chromium.org/8976014

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@115189 0039d316-1c4b-4281-b951-d872f2087c98
void NavigationController::NotifyEntryChanged(const NavigationEntry* entry,
                                              int index) {
  content::EntryChangedDetails det;
  det.changed_entry = entry;
  det.index = index;
  content::NotificationService::current()->Notify(
      content::NOTIFICATION_NAV_ENTRY_CHANGED,
      content::Source<NavigationController>(this),
      content::Details<content::EntryChangedDetails>(&det));
}

void NavigationController::NotifyEntryChanged(const NavigationEntry* entry,
                                              int index) {
  content::EntryChangedDetails det;
  det.changed_entry = entry;
  det.index = index;
  content::NotificationService::current()->Notify(
      content::NOTIFICATION_NAV_ENTRY_CHANGED,
      content::Source<NavigationController>(this),
      content::Details<content::EntryChangedDetails>(&det));
}
