[DevTools] Migrate usages of Target to RuntimeModel where makes sense

third_party/WebKit/Source/devtools/front_end/sources/EventListenerBreakpointsSidebarPane.js

 // Copyright (c) 2015 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
  */
 Sources.EventListenerBreakpointsSidebarPane = class extends UI.VBox {
   constructor() {
     super();
@@ skipping 167 matching lines @@
           'click', this._breakpointCheckboxClicked.bind(this, eventName, categoryItem.targetNames), true);
       breakpointItem.parent = categoryItem;
 
       categoryItem.children[eventName] = breakpointItem;
     }
     this._categoryItems.push(categoryItem);
   }
 
   _update() {
     var target = UI.context.flavor(SDK.Target);
-    var debuggerModel = SDK.DebuggerModel.fromTarget(target);
+    var debuggerModel = target ? target.model(SDK.DebuggerModel) : null;
     var details = debuggerModel ? debuggerModel.debuggerPausedDetails() : null;
 
     if (!details || details.reason !== SDK.DebuggerModel.BreakReason.EventListener) {
       if (this._highlightedElement) {
         this._highlightedElement.classList.remove('breakpoint-hit');
         delete this._highlightedElement;
       }
       return;
     }
     var eventName = details.auxData['eventName'];
@@ skipping 171 matching lines @@
       var breakpoint = breakpoints[i];
       if (breakpoint && typeof breakpoint.eventName === 'string')
         this._setBreakpoint(breakpoint.eventName, breakpoint.targetNames, target);
     }
   }
 };
 
 Sources.EventListenerBreakpointsSidebarPane.categoryListener = 'listener:';
 Sources.EventListenerBreakpointsSidebarPane.categoryInstrumentation = 'instrumentation:';
 Sources.EventListenerBreakpointsSidebarPane.eventTargetAny = '*';