[DevTools] Support multiple sessions in Target domain

third_party/WebKit/LayoutTests/inspector-protocol/debugger/debugger-step-into-dedicated-worker.html

Index: third_party/WebKit/LayoutTests/inspector-protocol/debugger/debugger-step-into-dedicated-worker.html
diff --git a/third_party/WebKit/LayoutTests/inspector-protocol/debugger/debugger-step-into-dedicated-worker.html b/third_party/WebKit/LayoutTests/inspector-protocol/debugger/debugger-step-into-dedicated-worker.html
index 6822980e32e778575da0fd1d3ddc5f949978694e..a3898d1637c7f1d16f2d323bcba6f9ee2fcdaa40 100644
--- a/third_party/WebKit/LayoutTests/inspector-protocol/debugger/debugger-step-into-dedicated-worker.html
+++ b/third_party/WebKit/LayoutTests/inspector-protocol/debugger/debugger-step-into-dedicated-worker.html
@@ -16,13 +16,13 @@ function startWorker()
 function test()
 {
 
-    var workerId;
+    var workerSessionId;
     var workerRequestId = 1;
     function sendCommandToWorker(method, params)
     {
         InspectorTest.sendCommand("Target.sendMessageToTarget",
             {
-                "targetId": workerId,
+                "sessionId": workerSessionId,
                 "message": JSON.stringify({ "method": method,
                                             "params": params,
                                             "id": workerRequestId++ })
@@ -41,7 +41,7 @@ function test()
 
     InspectorTest.eventHandler["Target.attachedToTarget"] = function(messageObject)
     {
-        workerId = messageObject["params"]["targetInfo"]["targetId"];
+        workerSessionId = messageObject["params"]["sessionId"];
         InspectorTest.log("Worker created");
         sendCommandToWorker("Debugger.enable", {});
         sendCommandToWorker("Runtime.runIfWaitingForDebugger", {});