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The test timed out in the following case:

1. document.location.search = "?n=v" requests a navigation.
2. Before the navigation happens, onload handler runTest() is executed.
3. document.forms.f.submit() navigates to
    ".../submit-change-fragment.html?n=v#firstaction"
4. Because the original document was ".../submit-change-fragment.html",
   onhashchange handler is NOT called.
5. No one calls testRunner.notifyDone().

This CL moves "?n=v" setting code to runTest(), and do early return to avoid the
form submission without "?n=v".

BUG=521860

Review URL: https://codereview.chromium.org/1302703002

git-svn-id: svn://svn.chromium.org/blink/trunk@200798 bbb929c8-8fbe-4397-9dbb-9b2b20218538