Fix inspector layout tests to deal send tab via event sender.

third_party/WebKit/LayoutTests/inspector/elements/edit/edit-dom-test.js

 function initialize_EditDOMTests()
 {
 
 // Preload codemirror which is used for "Edit as HTML".
 InspectorTest.preloadPanel("sources");
 
 InspectorTest.doAddAttribute = function(testName, dataNodeId, attributeText, next)
 {
     InspectorTest.domActionTestForNodeId(testName, dataNodeId, testBody, next);
 
     function testBody(node, done)
     {
         var editorElement = InspectorTest.editNodePart(node, "webkit-html-attribute");
-        editorElement.dispatchEvent(InspectorTest.createKeyEvent("Tab"));
+        eventSender.keyDown("Tab");
 
         InspectorTest.deprecatedRunAfterPendingDispatches(testContinuation);
 
         function testContinuation()
         {
             var editorElement = WebInspector.panels.elements._treeOutlines[0]._shadowRoot.getSelection().anchorNode.parentElement;
             editorElement.textContent = attributeText;
             editorElement.dispatchEvent(InspectorTest.createKeyEvent("Enter"));
             InspectorTest.addSniffer(WebInspector.ElementsTreeOutline.prototype, "_updateModifiedNodes", done);
         }
@@ skipping 50 matching lines @@
     var editorElement = InspectorTest.editNodePart(node, className);
     editorElement.textContent = newValue;
     editorElement.dispatchEvent(InspectorTest.createKeyEvent("Enter"));
     if (useSniffer)
         InspectorTest.addSniffer(WebInspector.ElementsTreeOutline.prototype, "_updateModifiedNodes", step2);
     else
         InspectorTest.deprecatedRunAfterPendingDispatches(step2);
 }
 
 }