Remove base::ScopedPtrHashMap from media/.

media/cdm/aes_decryptor.cc

Index: media/cdm/aes_decryptor.cc
diff --git a/media/cdm/aes_decryptor.cc b/media/cdm/aes_decryptor.cc
index 3f41e2941a9375239711bd1da2254b9f6e5895dd..919a54e6023023c98083693787bb5d8a5ab50940 100644
--- a/media/cdm/aes_decryptor.cc
+++ b/media/cdm/aes_decryptor.cc
@@ -561,7 +561,7 @@ bool AesDecryptor::AddDecryptionKey(const std::string& session_id,
   std::unique_ptr<SessionIdDecryptionKeyMap> inner_map(
       new SessionIdDecryptionKeyMap());
   inner_map->Insert(session_id, std::move(decryption_key));
-  key_map_.add(key_id, std::move(inner_map));
+  key_map_[key_id] = std::move(inner_map);
   return true;
 }