Do not call internals.settings.setOverlayScrollbarsEnabled() in onload

third_party/WebKit/LayoutTests/fast/scrolling/scrollbar-tickmarks-hittest.html

Index: third_party/WebKit/LayoutTests/fast/scrolling/scrollbar-tickmarks-hittest.html
diff --git a/third_party/WebKit/LayoutTests/fast/scrolling/scrollbar-tickmarks-hittest.html b/third_party/WebKit/LayoutTests/fast/scrolling/scrollbar-tickmarks-hittest.html
index ac87898c3ee9159e72ac9004bedbd96493350134..d87c75c944c70c8194bec1ab7ca7b03f19a7a41f 100644
--- a/third_party/WebKit/LayoutTests/fast/scrolling/scrollbar-tickmarks-hittest.html
+++ b/third_party/WebKit/LayoutTests/fast/scrolling/scrollbar-tickmarks-hittest.html
@@ -5,6 +5,10 @@
 
 <script>
 description('Checks that clicking on scrollbar works when tickmarks are added.');
+if (window.internals) {
+    window.internals.settings.setOverlayScrollbarsEnabled(true);
+}
+
 onload = function()
 {
     if (window.testRunner)
@@ -13,7 +17,6 @@ onload = function()
     var elt = document.getElementById('elt');
     range.selectNodeContents(elt);
     if (window.internals) {
-        window.internals.settings.setOverlayScrollbarsEnabled(true);
         window.internals.addTextMatchMarker(range, true);
     }
     if (window.eventSender) {