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8267990: Revisit some uses of synchronized in the HttpClient API #4275

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@@ -172,12 +172,15 @@ private static class SocketFlowTask implements RestartableTask {
public final void run(DeferredCompleter taskCompleter) {
try {
// non contentious synchronized for visibility.
// The logics of the sequential scheduler should ensure that
// the restartable task is running in only one thread at
// a given time: there should never be contention.
boolean locked = lock.tryLock();
assert locked : "contention detected in SequentialScheduler";
try {;
} finally {
if (locked) lock.unlock();
} finally {