Remove constructor arg

packages/dev-utils/src/blockchain_lifecycle.ts

@@ -1,11 +1,10 @@
-import { constants } from './constants';
 import { RPC } from './rpc';
 
 export class BlockchainLifecycle {
     private _rpc: RPC;
     private _snapshotIdsStack: number[];
     constructor() {
-        this._rpc = new RPC(constants.RPC_URL);
+        this._rpc = new RPC();
         this._snapshotIdsStack = [];
     }
     // TODO: In order to run these tests on an actual node, we should check if we are running against

packages/dev-utils/src/rpc.ts

@@ -1,11 +1,13 @@
 import * as ethUtil from 'ethereumjs-util';
 import * as request from 'request-promise-native';
 
+import { constants } from './constants';
+
 export class RPC {
     private _url: string;
     private _id: number;
-    constructor(url: string) {
-        this._url = url;
+    constructor() {
+        this._url = constants.RPC_URL;
         this._id = 0;
     }
     public async takeSnapshotAsync(): Promise<number> {