Eliminate use of __FlutterEngineFlushPendingTasksNow in GLFW shell #30730
Description
See #16912. Also, having to poll it makes the GLFW implementation take lots of CPU (which we could scale back with sleeps, but that's another hack).
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See #16912. Also, having to poll it makes the GLFW implementation take lots of CPU (which we could scale back with sleeps, but that's another hack).