DevTools: use target-based model accessors only.

Source/devtools/front_end/bindings/SASSSourceMapping.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 146 matching lines @@
         if (!cssURLs)
             return;
         if (!WebInspector.settings.cssReloadEnabled.get())
             return;
 
         var sassFile = this._networkMapping.uiSourceCodeForURL(sassURL);
         console.assert(sassFile);
         if (wasLoadedFromFileSystem)
             sassFile.requestMetadata(metadataReceived.bind(this));
         else
-            this._target.networkAgent().loadResourceForFrontend(WebInspector.resourceTreeModel.mainFrame.id, sassURL, undefined, sassLoadedViaNetwork.bind(this));
+            this._target.networkAgent().loadResourceForFrontend(this._target.resourceTreeModel.mainFrame.id, sassURL, undefined, sassLoadedViaNetwork.bind(this));
 
         /**
          * @param {?Protocol.Error} error
          * @param {number} statusCode
          * @param {!NetworkAgent.Headers} headers
          * @param {string} content
          * @this {WebInspector.SASSSourceMapping}
          */
         function sassLoadedViaNetwork(error, statusCode, headers, content)
         {
@@ skipping 100 matching lines @@
      */
     _reloadCSSFromNetwork: function(cssUISourceCode, sassURL, callback)
     {
         var cssURL = this._networkMapping.networkURL(cssUISourceCode);
         var data = this._pollDataForSASSURL[sassURL];
         if (!data) {
             callback(cssURL, sassURL, true);
             return;
         }
         var headers = { "if-modified-since": new Date(data.sassTimestamp.getTime() - 1000).toUTCString() };
-        this._target.networkAgent().loadResourceForFrontend(WebInspector.resourceTreeModel.mainFrame.id, cssURL, headers, contentLoaded.bind(this));
+        this._target.networkAgent().loadResourceForFrontend(this._target.resourceTreeModel.mainFrame.id, cssURL, headers, contentLoaded.bind(this));
 
         /**
          * @param {?Protocol.Error} error
          * @param {number} statusCode
          * @param {!NetworkAgent.Headers} headers
          * @param {string} content
          * @this {WebInspector.SASSSourceMapping}
          */
         function contentLoaded(error, statusCode, headers, content)
         {
@@ skipping 353 matching lines @@
         this._cssURLsForSASSURL = {};
         /** @type {!Object.<string, !Array.<function(?WebInspector.SourceMap)>>} */
         this._pendingSourceMapLoadingCallbacks = {};
         /** @type {!Object.<string, !{deadlineMs: number, dataByURL: !Object.<string, !{timer: number, previousPoll: number}>}>} */
         this._pollDataForSASSURL = {};
         /** @type {!Object.<string, !WebInspector.SourceMap>} */
         this._sourceMapByURL = {};
         this._sourceMapByStyleSheetURL = {};
     }
 }