[Merge to M-58] Add a warning for the deprecation of content-initiated data URL navigations

third_party/WebKit/LayoutTests/http/tests/security/popup-allowed-by-sandbox-is-sandboxed.html

Index: third_party/WebKit/LayoutTests/http/tests/security/popup-allowed-by-sandbox-is-sandboxed.html
diff --git a/third_party/WebKit/LayoutTests/http/tests/security/popup-allowed-by-sandbox-is-sandboxed.html b/third_party/WebKit/LayoutTests/http/tests/security/popup-allowed-by-sandbox-is-sandboxed.html
index a709cacaf1e6b5ec7310e7353c2b7c684452f047..c89f2e6a807a00bb53b4269f763d76a31165171b 100644
--- a/third_party/WebKit/LayoutTests/http/tests/security/popup-allowed-by-sandbox-is-sandboxed.html
+++ b/third_party/WebKit/LayoutTests/http/tests/security/popup-allowed-by-sandbox-is-sandboxed.html
@@ -9,9 +9,14 @@ if (window.testRunner) {
 <p>To run this test outside of DumpRenderTree, please disable your popup blocker!</p>
 <p>If you change this test, please be sure to change popup-allowed-by-sandbox-is-sandboxed-control.html as well!</p>
 <p>This test passes if it doesn't alert FAIL.</p>
-<iframe sandbox="allow-scripts allow-popups"
+<iframe sandbox="allow-scripts allow-popups allow-same-origin"
   src="data:text/html,
        <script>
-       var win = window.open('data:text/html,<form action=javascript:alert(/FAIL/) ><input type=submit></form><script>document.forms[0].submit(); if (window.testRunner) testRunner.notifyDone();<\/script>', '_blank');
+       var win = window.open('about:blank', '_blank');
+       win.document.write(
+          '<form action=javascript:alert(/FAIL/) ><input type=submit></form>' +
+          '<script>document.forms[0].submit();' +
+          'if (window.testRunner)testRunner.notifyDone();' +
+          '</' + 'script>');
        </script>"
   ></iframe>