DevTools: introduce multitarget model listeners

Source/devtools/front_end/network/NetworkPanel.js

Index: Source/devtools/front_end/network/NetworkPanel.js
diff --git a/Source/devtools/front_end/network/NetworkPanel.js b/Source/devtools/front_end/network/NetworkPanel.js
index d783c977fc357b7a0b53933a9e53d76141618ec7..cc0375a0e7ed3e353755020258743bc024feaba1 100644
--- a/Source/devtools/front_end/network/NetworkPanel.js
+++ b/Source/devtools/front_end/network/NetworkPanel.js
@@ -82,6 +82,14 @@ WebInspector.NetworkLogView = function(filterBar, coulmnsVisibilitySetting)
     this._recordButton.toggled = true;
 
     WebInspector.targetManager.observeTargets(this);
+    WebInspector.targetManager.addModelListener(WebInspector.NetworkManager, WebInspector.NetworkManager.EventTypes.RequestStarted, this._onRequestStarted, this);
+    WebInspector.targetManager.addModelListener(WebInspector.NetworkManager, WebInspector.NetworkManager.EventTypes.RequestUpdated, this._onRequestUpdated, this);
+    WebInspector.targetManager.addModelListener(WebInspector.NetworkManager, WebInspector.NetworkManager.EventTypes.RequestFinished, this._onRequestUpdated, this);
+
+    WebInspector.targetManager.addModelListener(WebInspector.ResourceTreeModel, WebInspector.ResourceTreeModel.EventTypes.WillReloadPage, this._willReloadPage, this);
+    WebInspector.targetManager.addModelListener(WebInspector.ResourceTreeModel, WebInspector.ResourceTreeModel.EventTypes.MainFrameNavigated, this._mainFrameNavigated, this);
+    WebInspector.targetManager.addModelListener(WebInspector.ResourceTreeModel, WebInspector.ResourceTreeModel.EventTypes.Load, this._loadEventFired, this);
+    WebInspector.targetManager.addModelListener(WebInspector.ResourceTreeModel, WebInspector.ResourceTreeModel.EventTypes.DOMContentLoaded, this._domContentLoadedEventFired, this);
 }
 
 WebInspector.NetworkLogView.HTTPSchemas = {"http": true, "https": true, "ws": true, "wss": true};
@@ -126,15 +134,6 @@ WebInspector.NetworkLogView.prototype = {
      */
     targetAdded: function(target)
     {
-        target.networkManager.addEventListener(WebInspector.NetworkManager.EventTypes.RequestStarted, this._onRequestStarted, this);
-        target.networkManager.addEventListener(WebInspector.NetworkManager.EventTypes.RequestUpdated, this._onRequestUpdated, this);
-        target.networkManager.addEventListener(WebInspector.NetworkManager.EventTypes.RequestFinished, this._onRequestUpdated, this);
-
-        target.resourceTreeModel.addEventListener(WebInspector.ResourceTreeModel.EventTypes.WillReloadPage, this._willReloadPage, this);
-        target.resourceTreeModel.addEventListener(WebInspector.ResourceTreeModel.EventTypes.MainFrameNavigated, this._mainFrameNavigated, this);
-        target.resourceTreeModel.addEventListener(WebInspector.ResourceTreeModel.EventTypes.Load, this._loadEventFired, this);
-        target.resourceTreeModel.addEventListener(WebInspector.ResourceTreeModel.EventTypes.DOMContentLoaded, this._domContentLoadedEventFired, this);
-
         target.networkLog.requests.forEach(this._appendRequest.bind(this));
     },
 
@@ -143,14 +142,6 @@ WebInspector.NetworkLogView.prototype = {
      */
     targetRemoved: function(target)
     {
-        target.networkManager.removeEventListener(WebInspector.NetworkManager.EventTypes.RequestStarted, this._onRequestStarted, this);
-        target.networkManager.removeEventListener(WebInspector.NetworkManager.EventTypes.RequestUpdated, this._onRequestUpdated, this);
-        target.networkManager.removeEventListener(WebInspector.NetworkManager.EventTypes.RequestFinished, this._onRequestUpdated, this);
-
-        target.resourceTreeModel.removeEventListener(WebInspector.ResourceTreeModel.EventTypes.WillReloadPage, this._willReloadPage, this);
-        target.resourceTreeModel.removeEventListener(WebInspector.ResourceTreeModel.EventTypes.MainFrameNavigated, this._mainFrameNavigated, this);
-        target.resourceTreeModel.removeEventListener(WebInspector.ResourceTreeModel.EventTypes.Load, this._loadEventFired, this);
-        target.resourceTreeModel.removeEventListener(WebInspector.ResourceTreeModel.EventTypes.DOMContentLoaded, this._domContentLoadedEventFired, this);
     },
 
     _addFilters: function()