remove unused params

src/app/debugger/debuggerUI/VmDebugger.js

@@ -38,7 +38,7 @@ function VmDebugger (_parentUI, _traceManager, _codeManager, _solidityProxy, _ca
     self.asmCode.changed([], '', -1)
   })
 
-  this.calldataPanel = new CalldataPanel(_parentUI, _traceManager)
+  this.calldataPanel = new CalldataPanel()
   _parentUI.event.register('indexChanged', this, function (index) {
     if (index < 0) return
     if (_parentUI.currentStepIndex !== index) return

src/app/debugger/debuggerUI/vmDebugger/CalldataPanel.js

@@ -2,9 +2,7 @@
 var DropdownPanel = require('./DropdownPanel')
 var yo = require('yo-yo')
 
-function CalldataPanel (_parentUI, _traceManager) {
-  this._parentUI = _parentUI
-  this.traceManager = _traceManager
+function CalldataPanel () {
   this.basicPanel = new DropdownPanel('Call Data', {json: true})
 }