Googler d0d76f214a Fix a race condition in HttpEngineDataSource
Pass the temporary CookieHandler as a parameter instead of setting it as a temporary process-default. This avoids a rare race condition, where the player is sending a request with preserveCookies option and runs the `CookieHandler.getDefault()` before a different thread sets a default cookie handler. Over 5 or so lines of code the new default might be reverted to null - this is now fixed.

PiperOrigin-RevId: 738052152
2025-03-18 10:16:08 -07:00
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