MemoryPressureCallback   37 base/memory/memory_pressure_listener.cc     const MemoryPressureListener::MemoryPressureCallback& callback)
MemoryPressureCallback   61 base/memory/memory_pressure_listener.h       const MemoryPressureCallback& memory_pressure_callback);
MemoryPressureCallback   70 base/memory/memory_pressure_listener.h   MemoryPressureCallback callback_;