Remove binance us rate oracle from binance

hummingbot/core/rate_oracle/sources/binance_rate_source.py

@@ -14,7 +14,6 @@ class BinanceRateSource(RateSourceBase):
     def __init__(self):
         super().__init__()
         self._binance_exchange: Optional[BinanceExchange] = None  # delayed because of circular reference
-        # self._binance_us_exchange: Optional[BinanceExchange] = None  # delayed because of circular reference
 
     @property
     def name(self) -> str:
@@ -26,7 +25,6 @@ async def get_prices(self, quote_token: Optional[str] = None) -> Dict[str, Decim
         results = {}
         tasks = [
             self._get_binance_prices(exchange=self._binance_exchange),
-            # self._get_binance_prices(exchange=self._binance_us_exchange, quote_token="USD"),
         ]
         task_results = await safe_gather(*tasks, return_exceptions=True)
         for task_result in task_results:
@@ -43,7 +41,6 @@ async def get_prices(self, quote_token: Optional[str] = None) -> Dict[str, Decim
     def _ensure_exchanges(self):
         if self._binance_exchange is None:
             self._binance_exchange = self._build_binance_connector_without_private_keys(domain="com")
-            # self._binance_us_exchange = self._build_binance_connector_without_private_keys(domain="us")
 
     @staticmethod
     async def _get_binance_prices(exchange: 'BinanceExchange', quote_token: str = None) -> Dict[str, Decimal]: