Reland 'Convert //net and //chromecast to std::unordered_*'

net/http/http_cache.h

Index: net/http/http_cache.h
diff --git a/net/http/http_cache.h b/net/http/http_cache.h
index 230a7f5bcef2a2529b1db73b6e99bd400e7c6005..7a8f8ffe2b4ecf6149d82156b603f2c64420496f 100644
--- a/net/http/http_cache.h
+++ b/net/http/http_cache.h
@@ -18,8 +18,8 @@
 #include <memory>
 #include <set>
 #include <string>
+#include <unordered_map>
 
-#include "base/containers/hash_tables.h"
 #include "base/files/file_path.h"
 #include "base/macros.h"
 #include "base/memory/weak_ptr.h"
@@ -261,10 +261,10 @@ class NET_EXPORT HttpCache : public HttpTransactionFactory,
     bool               doomed;
   };
 
-  typedef base::hash_map<std::string, ActiveEntry*> ActiveEntriesMap;
-  typedef base::hash_map<std::string, PendingOp*> PendingOpsMap;
-  typedef std::set<ActiveEntry*> ActiveEntriesSet;
-  typedef base::hash_map<std::string, int> PlaybackCacheMap;
+  using ActiveEntriesMap = std::unordered_map<std::string, ActiveEntry*>;
+  using PendingOpsMap = std::unordered_map<std::string, PendingOp*>;
+  using ActiveEntriesSet = std::set<ActiveEntry*>;
+  using PlaybackCacheMap = std::unordered_map<std::string, int>;
 
   // Methods ------------------------------------------------------------------