[DevTools] Cleanup DOMExtension.js.

third_party/WebKit/Source/devtools/front_end/ui/HistoryInput.js

Index: third_party/WebKit/Source/devtools/front_end/ui/HistoryInput.js
diff --git a/third_party/WebKit/Source/devtools/front_end/ui/HistoryInput.js b/third_party/WebKit/Source/devtools/front_end/ui/HistoryInput.js
index 54daad1e1836375e4ca2b68186b965b9167d9560..f8ab8a5626bdb33f5785447a39ded532b1f7a9d2 100644
--- a/third_party/WebKit/Source/devtools/front_end/ui/HistoryInput.js
+++ b/third_party/WebKit/Source/devtools/front_end/ui/HistoryInput.js
@@ -47,12 +47,12 @@ WebInspector.HistoryInput.prototype = {
         if (event.keyCode === WebInspector.KeyboardShortcut.Keys.Up.code) {
             this._historyPosition = Math.max(this._historyPosition - 1, 0);
             this.value = this._history[this._historyPosition];
-            this.dispatchEvent(createEvent("input", true, true));
+            this.dispatchEvent(new Event("input", {"bubbles": true, "cancelable": true}));
             event.consume(true);
         } else if (event.keyCode === WebInspector.KeyboardShortcut.Keys.Down.code) {
             this._historyPosition = Math.min(this._historyPosition + 1, this._history.length - 1);
             this.value = this._history[this._historyPosition];
-            this.dispatchEvent(createEvent("input", true, true));
+            this.dispatchEvent(new Event("input", {"bubbles": true, "cancelable": true}));
             event.consume(true);
         } else if (event.keyCode === WebInspector.KeyboardShortcut.Keys.Enter.code) {
             this._saveToHistory();