[DevTools] Save connected worker ids to send "detached" notification on restore.

third_party/WebKit/Source/devtools/front_end/sdk/TargetManager.js

Index: third_party/WebKit/Source/devtools/front_end/sdk/TargetManager.js
diff --git a/third_party/WebKit/Source/devtools/front_end/sdk/TargetManager.js b/third_party/WebKit/Source/devtools/front_end/sdk/TargetManager.js
index 52f19551b75146bdc8f0109192b8b2b61363ea3a..0f1ae0d7de7bab7fcce11b0ecd57a4c3963807bc 100644
--- a/third_party/WebKit/Source/devtools/front_end/sdk/TargetManager.js
+++ b/third_party/WebKit/Source/devtools/front_end/sdk/TargetManager.js
@@ -476,12 +476,6 @@ SDK.ChildTargetManager = class {
       this._targetAgent.setRemoteLocations([{host: 'localhost', port: 9229}]);
       this._targetAgent.setDiscoverTargets(true);
     }
-
-    this._eventListeners = [];
-    if (resourceTreeModel) {
-      this._eventListeners.push(resourceTreeModel.addEventListener(
-          SDK.ResourceTreeModel.Events.MainFrameNavigated, this._detachWorkersOnMainFrameNavigated, this));
-    }
   }
 
   suspend() {
@@ -499,7 +493,6 @@ SDK.ChildTargetManager = class {
   }
 
   dispose() {
-    Common.EventTarget.removeEventListeners(this._eventListeners);
     // TODO(dgozman): this is O(n^2) when removing main target.
     var childTargets = this._targetManager._targets.filter(child => child.parentTarget() === this._parentTarget);
     for (var child of childTargets)
@@ -525,16 +518,6 @@ SDK.ChildTargetManager = class {
     return 0;
   }
 
-  _detachWorkersOnMainFrameNavigated() {
-    // TODO(dgozman): send these from backend.
-    var idsToDetach = [];
-    for (var target of this._targetManager._targets) {
-      if (target.parentTarget() === this._parentTarget && target[SDK.TargetManager._isWorkerSymbol])
-        idsToDetach.push(target.id());
-    }
-    idsToDetach.forEach(id => this.detachedFromTarget(id));
-  }
-
   /**
    * @override
    * @param {!Protocol.Target.TargetInfo} targetInfo