[DevTools] Introduce Common.List used as a backend for list controls

third_party/WebKit/LayoutTests/http/tests/inspector/console-test.js

 var initialize_ConsoleTest = function() {
 
 InspectorTest.preloadModule("source_frame");
 InspectorTest.preloadPanel("console");
 
 InspectorTest.selectMainExecutionContext = function()
 {
     var executionContexts = InspectorTest.runtimeModel.executionContexts();
     for (var context of executionContexts) {
         if (context.isDefault) {
@@ skipping 377 matching lines @@
 {
     var callback;
     var promise = new Promise((fullfill) => callback = fullfill);
     InspectorTest.waitUntilNthMessageReceived(count, callback);
     return promise;
 }
 
 InspectorTest.changeExecutionContext = function(namePrefix)
 {
     var selector = Console.ConsoleView.instance()._consoleContextSelector;
-    for (var executionContext of selector._list._items) {
+    for (var executionContext of selector._items._items) {
         if (selector._titleFor(executionContext).startsWith(namePrefix)) {
             UI.context.setFlavor(SDK.ExecutionContext, executionContext);
             return;
         }
     }
     InspectorTest.addResult("FAILED: context with prefix: "  + namePrefix + " not found in the context list");
 }
 
 InspectorTest.waitForConsoleMessages = function(expectedCount, callback)
 {
@@ skipping 32 matching lines @@
                     offset: offset - charCount
                 };
             }
             charCount += length;
         }
         return null;
     }
 }
 
 }