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Previously the renderer checked a process-wide command-line switch to decide whether to create a Node.js environment for dedicated workers. When a renderer process hosted multiple WebContents with different nodeIntegrationInWorker values (e.g. via window.open with overridden webPreferences in setWindowOpenHandler), all workers in the process used whichever value the first WebContents set on the command line. Instead, plumb the flag through blink's WorkerSettings at worker creation time, copying it from the initiating frame's WebPreferences. The check on the worker thread then reads the per-worker value. Nested workers inherit the flag from their parent worker via WorkerSettings::Copy. The --node-integration-in-worker command-line switch is removed as it is no longer consumed.