Fix flakiness of fast/forms/submit-change-fragment.html.

LayoutTests/fast/forms/submit-change-fragment.html

Index: LayoutTests/fast/forms/submit-change-fragment.html
diff --git a/LayoutTests/fast/forms/submit-change-fragment.html b/LayoutTests/fast/forms/submit-change-fragment.html
index fcfb66192a2e1d92a92eef2911ce1856fc4b6849..a310c77504b76c050f60c793c943d4ecfc1df645 100644
--- a/LayoutTests/fast/forms/submit-change-fragment.html
+++ b/LayoutTests/fast/forms/submit-change-fragment.html
@@ -5,10 +5,11 @@ if (window.testRunner) {
     testRunner.waitUntilDone();
 }
 
-if (document.location.href.indexOf("n=v") == -1)
-    document.location.search = "?n=v";
-
 function runTest() {
+    if (document.location.href.indexOf("n=v") == -1) {
+        document.location.search = "?n=v";
+        return;
+    }
     document.forms.f.action="#firstaction";
     document.forms.f.submit();
     document.forms.f.action="#secondaction";