Devtools: get rid of ProjectWillReset event, introduce ProjectRemoved instead of it

Source/devtools/front_end/sdk/ScriptSnippetModel.js

 /*
  * Copyright (C) 2012 Google 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:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 31 matching lines @@
     /** @type {!Map.<!WebInspector.UISourceCode, string>} */
     this._snippetIdForUISourceCode = new Map();
 
     /** @type {!Map.<!WebInspector.Target, !WebInspector.SnippetScriptMapping>} */
     this._mappingForTarget = new Map();
     this._snippetStorage = new WebInspector.SnippetStorage("script", "Script snippet #");
     this._lastSnippetEvaluationIndexSetting = WebInspector.settings.createSetting("lastSnippetEvaluationIndex", 0);
     this._projectId = WebInspector.projectTypes.Snippets + ":";
     this._projectDelegate = new WebInspector.SnippetsProjectDelegate(workspace, this, this._projectId);
     this._project = this._workspace.project(this._projectId);
-    this.reset();
+    this._loadSnippets();
     WebInspector.targetManager.observeTargets(this);
 }
 
 WebInspector.ScriptSnippetModel.prototype = {
 
     /**
      * @param {!WebInspector.Target} target
      */
     targetAdded: function(target)
     {
@@ skipping 301 matching lines @@
     _snippetIdForSourceURL: function(sourceURL)
     {
         var snippetPrefix = WebInspector.Script.snippetSourceURLPrefix;
         if (!sourceURL.startsWith(snippetPrefix))
             return null;
         var splitURL = sourceURL.substring(snippetPrefix.length).split("_");
         var snippetId = splitURL[0];
         return snippetId;
     },
 
-    reset: function()
-    {
-        this._mappingForTarget.values().forEach(function(mapping){mapping._reset()});
-        /** @type {!Object.<string, !WebInspector.UISourceCode>} */
-        this._uiSourceCodeForSnippetId = {};
-        this._snippetIdForUISourceCode = new Map();
-        this._projectDelegate.reset();
-        this._loadSnippets();
-    },
-
     __proto__: WebInspector.Object.prototype
 }
 
 /**
  * @constructor
  * @implements {WebInspector.ScriptSourceMapping}
  * @param {!WebInspector.Target} target
  * @param {!WebInspector.ScriptSnippetModel} scriptSnippetModel
  */
 WebInspector.SnippetScriptMapping = function(target, scriptSnippetModel)
@@ skipping 279 matching lines @@
         this._model.deleteScriptSnippet(path);
     },
 
     __proto__: WebInspector.ContentProviderBasedProjectDelegate.prototype
 }
 
 /**
  * @type {!WebInspector.ScriptSnippetModel}
  */
 WebInspector.scriptSnippetModel;