Fix layout tests that would fail if ScrollAnchoring was promoted to experimental

third_party/WebKit/LayoutTests/editing/execCommand/insert-line-break-no-scroll.html

 <p>Matching other execCommand identifiers, execCommand("InsertLineBreak") should not scroll the page to make selection visible.</p>
 <p>This test only works in WebKit, as other engines do not implement this command.</p>
 <div contenteditable>a</div>
 <div style="height:10000"></div>
 <script>
   var text = document.getElementsByTagName('div')[0].firstChild;
   window.getSelection().setBaseAndExtent(text, 0, text, 0);
   window.scrollTo(0, 1000);
   document.execCommand("InsertLineBreak");
 
-  var result = (window.pageYOffset == 1000) ? "SUCCESS" : "FAILURE";
+  var result = (window.pageYOffset >= 1000) ? "SUCCESS" : "FAILURE";

[ymalik, 2016/07/22 16:53:24]

@skobes, the purpose of this test is to verify that we don't scroll to make the
selection visible. Because we're inserting a line break, scroll anchoring makes
an adjustment so that the viewport doesn't move. In this particular case, this
is probably a better user experience. Hence, I think loosening the '==' to '>='
is probably fine.

[skobes, 2016/07/25 20:46:38]

Acknowledged.

   if (window.testRunner) {
     testRunner.dumpAsText();
     document.write(result);
   } else
     alert(result);
 </script>