Allow to specify elide behavior for confrim infobar message

Used in "<extension name> is debugging this browser" infobar.

Bug: 823194
Change-Id: Iff6627097c020cccca8f7cc3e21a803a41fd8f2c
Reviewed-on: https://chromium-review.googlesource.com/1048064
Commit-Queue: Dmitry Gozman <dgozman@chromium.org>
Reviewed-by: Devlin <rdevlin.cronin@chromium.org>
Reviewed-by: Peter Kasting <pkasting@chromium.org>
Cr-Commit-Position: refs/heads/master@{#557245}
void GlobalConfirmInfoBar::OnManagerShuttingDown(
    infobars::InfoBarManager* manager) {
  manager->RemoveObserver(this);
  proxies_.erase(manager);
}

void GlobalConfirmInfoBar::OnManagerShuttingDown(
    infobars::InfoBarManager* manager) {
  manager->RemoveObserver(this);
  proxies_.erase(manager);
}
