remove uneeded commands

test-browser/commands/elementIsNotPresent.js

-const EventEmitter = require('events')
-
-class ElementIsPresent extends EventEmitter {
-  command (cssSelector) {
-    this.api.execute((cssSelector) => {
-      return !!document.querySelector(cssSelector)
-    }, [cssSelector], (result) => {
-      this.api.assert.equal(false, result.value, `${cssSelector} should not be present`)
-      this.emit('complete')
-    })
-    return this
-  }
-}
-
-module.exports = ElementIsPresent

test-browser/commands/elementIsPresent.js

-const EventEmitter = require('events')
-
-class ElementIsPresent extends EventEmitter {
-  command (cssSelector) {
-    this.api.execute((cssSelector) => {
-      return !!document.querySelector(cssSelector)
-    }, [cssSelector], (result) => {
-      this.api.assert.equal(true, result.value, `${cssSelector} should be present`)
-      this.emit('complete')
-    })
-    return this
-  }
-}
-
-module.exports = ElementIsPresent

test-browser/tests/editor.test.js

@@ -91,7 +91,7 @@ module.exports = {
     .executeScript('remix.exeCurrent()')
     .switchFile('browser/3_Ballot.sol')
     .editorScroll('down', 60)
-    .elementIsNotPresent('.highlightLine32')
+    .waitForElementNotPresent('.highlightLine32')
     .checkElementStyle('.highlightLine40', 'background-color', 'rgb(8, 108, 181)')
     .checkElementStyle('.highlightLine50', 'background-color', 'rgb(8, 108, 181)')
   },
@@ -102,9 +102,9 @@ module.exports = {
     .executeScript('remix.exeCurrent()')
     .switchFile('browser/3_Ballot.sol')
     .editorScroll('down', 60)
-    .elementIsNotPresent('.highlightLine32')
-    .elementIsNotPresent('.highlightLine40')
-    .elementIsNotPresent('.highlightLine50')
+    .waitForElementNotPresent('.highlightLine32')
+    .waitForElementNotPresent('.highlightLine40')
+    .waitForElementNotPresent('.highlightLine50')
     .end()
   },