Replace undefined std::Container with std::Container
std::vector (and other container types:
deque/forward_list/list/multiset/queue/set/stack) are undefined and disallowed
by libstdc++. Future libc++ will report errors as well. Migrate to
std::Container to bring code in-line with the C++ standard and the behavior
of other C++ standard libraries. Make similar changes to absl::flat_hash_set.
Replace undefined std::Container with std::Container
std::vector (and other container types:
deque/forward_list/list/multiset/queue/set/stack) are undefined and disallowed
by libstdc++. Future libc++ will report errors as well. Migrate to
std::Container to bring code in-line with the C++ standard and the behavior
of other C++ standard libraries. Make similar changes to absl::flat_hash_set.