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a1458f3348
1. Replace HashMap and HashSet with std::unordered_map and std::unordered_set respectively. 2. Extract the pair hasher into a struct pair_hash. 3. Delete collections_port.h 4. Convert explicit iterator based loops to auto based loops where sensible. Change-Id: Ib88bcd13a7463d18435639d3b771abaa52080efb