Revert of "Blink does not respect input.selectionStart and input.selectionEnd for some cases"

LayoutTests/editing/deleting/5290534.html

 <p>This tests for a crash when adding/removing content from a search field that is inside an editable region.</p>
 
 <div contenteditable="true"><input id="search" type="search"></div>
 <ul id="console"></ul>
 
 <script>
 function log(msg)
 {
     li = document.createElement("li");
     li.appendChild(document.createTextNode(msg));
     document.getElementById("console").appendChild(li);
 }
 
 if (window.testRunner)
     window.testRunner.dumpAsText();
     
 var search = document.getElementById("search");
-search.focus();
+search.setSelectionRange(0, 0);
 document.execCommand("InsertText", false, "x");
 if (search.value != "x")
     log("Failure: text wasn't added to the search field.");
 document.execCommand("Delete");
 if (search.value == "")
     log("Success! Test successfully removed text from the search field.");
 </script>