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* More efficient generation of ImmutableWorkerHolder from WorkerHolder. Taking the work done in #12096 a little further: 1) Applying a similar optimization to WorkerHolder (HttpRemoteTaskRunner). The original patch only helped with the ZkWorker (RemoteTaskRunner). 2) Improve the ZkWorker version somewhat by avoiding multiple iterations through the task announcements map. * Pick better names and use better logic. * Only runnable tasks. * Fix test. * Fix testBlacklistZKWorkers50Percent.