Selection API: Do not change focus by Selection functions.

third_party/WebKit/LayoutTests/fast/events/script-tests/inputText-never-fired-on-keydown-cancel.js

 description('Test that ensure textInput events should not fired when preceding key events are cancelled');
 
 var targetRoot = document.createElement("div");
 targetRoot.innerHTML += "<input type='text' id='targetInput' />";
 targetRoot.innerHTML += "<textarea id='targetTextarea'></textarea>";
 targetRoot.innerHTML += "<div id='targetEditable' contentEditable></div>";
 document.body.appendChild(targetRoot);
 
 var targetInput = document.getElementById("targetInput");
 var targetTextarea = document.getElementById("targetTextarea");
@@ skipping 37 matching lines @@
     eventSender.keyDown("a");
     shouldBe("null", "receivedEventTarget");
 }
 
 targetInput.focus();
 test(targetInput);
 
 targetTextarea.focus();
 test(targetTextarea);
 
+targetEditable.focus();
 window.getSelection().setBaseAndExtent(targetEditable, 0, targetEditable, 0);
 test(targetEditable);
 
 targetRoot.style.display = "none";