DevTools: Use JS symbols instead of strings for eligible events.

third_party/WebKit/Source/devtools/front_end/resources/DatabaseQueryView.js

 /*
  * Copyright (C) 2008 Apple Inc. All Rights Reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
  *    notice, this list of conditions and the following disclaimer in the
@@ skipping 30 matching lines @@
     this._promptElement.appendChild(createElement("br"));
     this._promptElement.addEventListener("keydown", this._promptKeyDown.bind(this), true);
     this.element.appendChild(this._promptElement);
 
     this._prompt = new WebInspector.TextPromptWithHistory(this.completions.bind(this), " ");
     this._proxyElement = this._prompt.attach(this._promptElement);
 
     this.element.addEventListener("click", this._messagesClicked.bind(this), true);
 }
 
+/** @enum {symbol} */
 WebInspector.DatabaseQueryView.Events = {
-    SchemaUpdated: "SchemaUpdated"
+    SchemaUpdated: Symbol("SchemaUpdated")
 }
 
 WebInspector.DatabaseQueryView.prototype = {
     _messagesClicked: function()
     {
         if (!this._prompt.isCaretInsidePrompt() && this.element.isComponentSelectionCollapsed())
             this._prompt.moveCaretToEndOfPrompt();
     },
 
     /**
@@ skipping 132 matching lines @@
         element.appendChild(commandTextElement);
 
         var resultElement = createElement("div");
         resultElement.className = "database-query-result";
         element.appendChild(resultElement);
         return resultElement;
     },
 
     __proto__: WebInspector.VBox.prototype
 }