[DevTools] Remove SDKModels' fromTarget methods

third_party/WebKit/Source/devtools/front_end/main/ExecutionContextSelector.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.
 /**
  * @implements {SDK.TargetManager.Observer}
  * @unrestricted
  */
 Main.ExecutionContextSelector = class {
   /**
    * @param {!SDK.TargetManager} targetManager
@@ skipping 111 matching lines @@
 
   /**
    * @param {!SDK.ExecutionContext} executionContext
    * @return {boolean}
    */
   _isDefaultContext(executionContext) {
     if (!executionContext.isDefault || !executionContext.frameId)
       return false;
     if (executionContext.target().parentTarget())
       return false;
-    var resourceTreeModel = SDK.ResourceTreeModel.fromTarget(executionContext.target());
+    var resourceTreeModel = executionContext.target().model(SDK.ResourceTreeModel);
     var frame = resourceTreeModel && resourceTreeModel.frameForId(executionContext.frameId);
     if (frame && frame.isMainFrame())
       return true;
     return false;
   }
 
   /**
    * @param {!Common.Event} event
    */
   _onExecutionContextCreated(event) {
@@ skipping 54 matching lines @@
           newContext = executionContexts[0];
           break;
         }
       }
     }
     this._ignoreContextChanged = true;
     this._context.setFlavor(SDK.ExecutionContext, newContext);
     this._ignoreContextChanged = false;
   }
 };