DevTools: get rid of WebInspector.cssModel, use target models instead

Source/devtools/front_end/sdk/Target.js

 /*
  * Copyright 2014 The Chromium Authors. All rights reserved.
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 /**
  * @constructor
  * @extends {Protocol.Agents}
  * @param {string} name
@@ skipping 82 matching lines @@
         return !!this._capabilities[capability];
     },
 
     /**
      * @param {function(!WebInspector.Target)=} callback
      */
     _loadedWithCapabilities: function(callback)
     {
         /** @type {!WebInspector.ConsoleModel} */
         this.consoleModel = new WebInspector.ConsoleModel(this);
-        // This and similar lines are needed for compatibility.
-        if (!WebInspector.consoleModel)
-            WebInspector.consoleModel = this.consoleModel;
 
         /** @type {!WebInspector.NetworkManager} */
         this.networkManager = new WebInspector.NetworkManager(this);
         if (!WebInspector.networkManager)
             WebInspector.networkManager = this.networkManager;
 
         /** @type {!WebInspector.ResourceTreeModel} */
         this.resourceTreeModel = new WebInspector.ResourceTreeModel(this);
         if (!WebInspector.resourceTreeModel)
             WebInspector.resourceTreeModel = this.resourceTreeModel;
@@ skipping 195 matching lines @@
      * @return {!Array.<!WebInspector.Target>}
      */
     targets: function()
     {
         return this._targets.slice();
     },
 
     /**
      * @return {?WebInspector.Target}
      */
-    activeTarget: function()
+    mainTarget: function()
     {
         return this._targets[0];
     }
 }
 
 /**
  * @interface
  */
 WebInspector.TargetManager.Observer = function()
 {
 }
 
 WebInspector.TargetManager.Observer.prototype = {
     /**
      * @param {!WebInspector.Target} target
      */
     targetAdded: function(target) { },
 
     /**
      * @param {!WebInspector.Target} target
      */
     targetRemoved: function(target) { },
 }
 
 /**
  * @type {!WebInspector.TargetManager}
  */
 WebInspector.targetManager = new WebInspector.TargetManager();