remove unused file

libs/remix-debug/src/cmdline/contextManager.js

-const remixLib = require('@remix-project/remix-lib')
-
-const EventManager = remixLib.EventManager
-const Web3Providers = remixLib.vm.Web3Providers
-const DummyProvider = remixLib.vm.DummyProvider
-const init = remixLib.init
-
-class ContextManager {
-  constructor (executionContext) {
-    this.executionContext = executionContext
-    this.web3 = this.executionContext.web3()
-    this.event = new EventManager()
-  }
-
-  initProviders () {
-    this.web3Providers = new Web3Providers()
-    this.addProvider('DUMMYWEB3', new DummyProvider())
-    this.switchProvider('DUMMYWEB3')
-
-    this.addProvider('vm', this.executionContext.vm())
-    this.addProvider('injected', this.executionContext.internalWeb3())
-    this.addProvider('web3', this.executionContext.internalWeb3())
-    this.switchProvider(this.executionContext.getProvider())
-  }
-
-  getWeb3 () {
-    return this.web3
-  }
-
-  addProvider (type, obj) {
-    this.web3Providers.addProvider(type, obj)
-    this.event.trigger('providerAdded', [type])
-  }
-
-  switchProvider(type, cb) {
-    this.web3Providers.get(type, (error, obj) => {
-      if (error) {
-        return console.log('provider ' + type + ' not defined')
-      }
-      this.web3 = obj
-      this.executionContext.detectNetwork((error, network) => {
-        if (error || !network) {
-          this.web3 = obj
-        } else {
-          var webDebugNode = init.web3DebugNode(network.name)
-          this.web3 = (!webDebugNode ? obj : webDebugNode)
-        }
-        this.event.trigger('providerChanged', [type, this.web3])
-        if (cb) return cb()
-      })
-      this.event.trigger('providerChanged', [type, this.web3])
-    })
-  }
-
-}
-
-module.exports = ContextManager