Update some QuicUnorderedMap to QuicHashMap. All of them do not need pointer stability based on my inspection. Most of them are not used in production, the only exception is quic_spdy_client_session_base.h, which is used in Chromium. gfe-relnote: (n/a) Code not used in GFE. PiperOrigin-RevId: 308116637 Change-Id: Iaa85b8edbdcef7849c870b41eefcfa1984cd53c7