DevTools: introduce multitarget model listeners

Source/devtools/front_end/sdk/DOMModel.js

Index: Source/devtools/front_end/sdk/DOMModel.js
diff --git a/Source/devtools/front_end/sdk/DOMModel.js b/Source/devtools/front_end/sdk/DOMModel.js
index 32d38ed80432bc8fe7267a12f5db2d158c107d7e..66253b66f01e67fc67155c7d7a47013946ff1eb1 100644
--- a/Source/devtools/front_end/sdk/DOMModel.js
+++ b/Source/devtools/front_end/sdk/DOMModel.js
@@ -914,11 +914,11 @@ WebInspector.DOMDocument.prototype = {
 
 /**
  * @constructor
- * @extends {WebInspector.SDKObject}
+ * @extends {WebInspector.SDKModel}
  * @param {!WebInspector.Target} target
  */
 WebInspector.DOMModel = function(target) {
-    WebInspector.SDKObject.call(this, target);
+    WebInspector.SDKModel.call(this, WebInspector.DOMModel, target);
 
     this._agent = target.domAgent();
 
@@ -1690,7 +1690,7 @@ WebInspector.DOMModel.prototype = {
         }
     },
 
-    __proto__: WebInspector.SDKObject.prototype
+    __proto__: WebInspector.SDKModel.prototype
 }
 
 /**