remove sendAsync deprecation comments

src/MetamaskInpageProvider.js

@@ -53,7 +53,6 @@ module.exports = class MetamaskInpageProvider extends SafeEventEmitter {
         experimentalMethods: false,
         isConnected: false,
         send: false,
-        // sendAsync: false,
         // events
         events: {
           chainIdChanged: false,
@@ -257,6 +256,16 @@ module.exports = class MetamaskInpageProvider extends SafeEventEmitter {
     })
   }
 
+  /**
+   * Submit a JSON-RPC request object and a callback to make an RPC method call.
+   *
+   * @param {Object} payload - The RPC request object.
+   * @param {Function} callback - The callback function.
+   */
+  sendAsync (payload, cb) {
+    this._rpcRequest(payload, cb)
+  }
+
   /**
    * We override the following event methods so that we can warn consumers
    * about deprecated events:
@@ -563,21 +572,6 @@ module.exports = class MetamaskInpageProvider extends SafeEventEmitter {
     return this._sendSync(methodOrPayload)
   }
 
-  /**
-   * Submit a JSON-RPC request object and a callback to make an RPC method call.
-   *
-   * @param {Object} payload - The RPC request object.
-   * @param {Function} callback - The callback function.
-   */
-  sendAsync (payload, cb) {
-
-    // if (!this._state.sentWarnings.sendAsync) {
-    //   log.warn(messages.warnings.sendAsyncDeprecation)
-    //   this._state.sentWarnings.sendAsync = true
-    // }
-    this._rpcRequest(payload, cb)
-  }
-
   /**
    * DEPRECATED
    * Internal backwards compatibility method, used in send.