DevTools: introduce multitarget model listeners

Source/devtools/front_end/sdk/RuntimeModel.js

Index: Source/devtools/front_end/sdk/RuntimeModel.js
diff --git a/Source/devtools/front_end/sdk/RuntimeModel.js b/Source/devtools/front_end/sdk/RuntimeModel.js
index 043a0131d80eec76e289b7ac250d518bccd6c623..41e539b4233b85546076fffa31b4d03878e051d9 100644
--- a/Source/devtools/front_end/sdk/RuntimeModel.js
+++ b/Source/devtools/front_end/sdk/RuntimeModel.js
@@ -30,12 +30,12 @@
 
 /**
  * @constructor
- * @extends {WebInspector.SDKObject}
+ * @extends {WebInspector.SDKModel}
  * @param {!WebInspector.Target} target
  */
 WebInspector.RuntimeModel = function(target)
 {
-    WebInspector.SDKObject.call(this, target);
+    WebInspector.SDKModel.call(this, WebInspector.RuntimeModel, target);
 
     this._debuggerModel = target.debuggerModel;
     this._agent = target.runtimeAgent();
@@ -129,7 +129,7 @@ WebInspector.RuntimeModel.prototype = {
         return new WebInspector.RemoteObjectProperty(name, this.createRemoteObjectFromPrimitiveValue(value));
     },
 
-    __proto__: WebInspector.SDKObject.prototype
+    __proto__: WebInspector.SDKModel.prototype
 }
 
 /**