Replace uses of hash_map with unordered_map
Replace uses of hash_map with unordered_map

hash_map no longer exists in Visual C++ 2015.
A=Brian Smith <brian@briansmith.org>
R=ted at https://bugzilla.mozilla.org/show_bug.cgi?id=1119072

git-svn-id: 7939527bf0a06ad24ad020f729d5600cb42ed5d7@1419 4c0a9323-5329-0410-9bdc-e9ce6186880e

bittorrent/breakpad,bittorrent/breakpad,bittorrent/breakpad,bittorrent/breakpad,bittorrent/breakpad,bittorrent/breakpad,bittorrent/breakpad