move executionContext initialization to blockchain object

src/app.js

@@ -23,8 +23,6 @@ var toolTip = require('./app/ui/tooltip')
 var CompilerMetadata = require('./app/files/compiler-metadata')
 var CompilerImport = require('./app/compiler/compiler-imports')
 
-var executionContext = remixLib.execution.executionContext
-
 const Blockchain = require('./app/tabs/runTab/model/blockchain.js')
 
 const PluginManagerComponent = require('./app/components/plugin-manager-component')
@@ -225,7 +223,7 @@ Please make a backup of your contracts and start using http://remix.ethereum.org
   const fileManager = new FileManager(editor)
   registry.put({api: fileManager, name: 'filemanager'})
 
-  const blockchain = new Blockchain(registry.get('config').api, executionContext)
+  const blockchain = new Blockchain(registry.get('config').api)
 
   // ----------------- compilation metadata generation servive ----------------------------
   const compilerMetadataGenerator = new CompilerMetadata(blockchain, fileManager, registry.get('config').api)

src/app/tabs/runTab/model/blockchain.js

@@ -4,6 +4,7 @@ const txExecution = remixLib.execution.txExecution
 const typeConversion = remixLib.execution.typeConversion
 const Txlistener = remixLib.execution.txListener
 const EventManager = remixLib.EventManager
+const executionContext = remixLib.execution.executionContext
 const ethJSUtil = require('ethereumjs-util')
 const Personal = require('web3-eth-personal')
 const Web3 = require('web3')
@@ -13,7 +14,7 @@ import { UniversalDApp } from 'remix-lib'
 class Blockchain {
 
   // NOTE: the config object will need to be refactored out in remix-lib
-  constructor (config, executionContext) {
+  constructor (config) {
     this.event = new EventManager()
     this.executionContext = executionContext
     this.udapp = new UniversalDApp(config, this.executionContext)