DevTools: fix evaluation on the last async call stack in chain

third_party/WebKit/LayoutTests/inspector/sources/debugger-async/async-callstack-eval.html

Index: third_party/WebKit/LayoutTests/inspector/sources/debugger-async/async-callstack-eval.html
diff --git a/third_party/WebKit/LayoutTests/inspector/sources/debugger-async/async-callstack-eval.html b/third_party/WebKit/LayoutTests/inspector/sources/debugger-async/async-callstack-eval.html
index 5063c695ab24b64cd6dedb39116b75ccbf18e148..365f302fba380c60f03a9fe3e654d6201b76ea8e 100644
--- a/third_party/WebKit/LayoutTests/inspector/sources/debugger-async/async-callstack-eval.html
+++ b/third_party/WebKit/LayoutTests/inspector/sources/debugger-async/async-callstack-eval.html
@@ -6,6 +6,7 @@
 <script>
 
 var a = "FAIL";
+var g = "PASS";
 function testFunction()
 {
     var a = "PASS";
@@ -46,11 +47,16 @@ var test = function()
     {
         InspectorTest.captureStackTrace(callFrames, asyncStackTrace);
 
+        selectCallFrameAndRun(1, step3);
+    }
+
+    function selectCallFrameAndRun(frameNumber, callback)
+    {
         var pane = WebInspector.panels.sources.sidebarPanes.callstack;
-        var frame = pane.callFrames[1];
+        var frame = pane.callFrames[frameNumber];
         InspectorTest.addResult("Select call frame: " + frame.title());
         pane._callFrameSelected(frame);
-        InspectorTest.runAfterPendingDispatches(step3);
+        InspectorTest.runAfterPendingDispatches(callback);
     }
 
     function step3()
@@ -60,7 +66,17 @@ var test = function()
 
     function step4()
     {
-        InspectorTest.evaluateInConsoleAndDump("b", tearDown);
+        InspectorTest.evaluateInConsoleAndDump("b", step5);
+    }
+
+    function step5()
+    {
+        selectCallFrameAndRun(3, step6);
+    }
+
+    function step6()
+    {
+        InspectorTest.evaluateInConsoleAndDump("g", tearDown);
     }
 
     function tearDown()