Convert dfg-arguments-alias-activation.html to utilize w3c test harness

This patch changes "dfg-arguments-alias-activation.html" to utilize w3c test
harnes for ease of maintenance and avoid timeout for dumping result.

This patch is a preparation of the patch[1].

[1] http://crrev.com/c/1337224 Utilize NGInlineNode::GetOffsetMapping() in
Element#innerText

Change-Id: I5fcd46f0dd31eb8869917af288d7ad385626612c
Reviewed-on: https://chromium-review.googlesource.com/c/1345752Reviewed-by: Kent Tamura <tkent@chromium.org>
Commit-Queue: Yoshifumi Inoue <yosin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#609955}

third_party/WebKit/LayoutTests/fast/js/dfg-arguments-alias-activation.html

+<script src=../../resources/testharness.js></script>
+<script src=../../resources/testharnessreport.js></script>
 <p>This tests verifies access to captured arguments via an optimized-away arguments object.
 </p>
-<pre id="console"></pre>
-
 <script>
-function log(s)
-{
-	document.getElementById("console").appendChild(document.createTextNode(s + "\r\n"));
-}
-
-function shouldBe(a, aDescription, b)
-{
-	if (a == b) {
-		log("PASS: " + aDescription + " should be " + b + " and is.");
-		return;
-	}
-	log("FAIL: " + aDescription + " should be " + b + " but instead is " + a + ".");
-}
-
-if (window.testRunner) {
-	testRunner.dumpAsText();
-}
-
 // In-bounds of declared and passed arguments, no activation, before tear-off.
 function f0(x) {
     return arguments[0] || function() { return x; };
@@ -61,14 +43,16 @@ function f7(x) {
     return function() { return x; } && arguments;
 }
 
-for (var i = 0; i < 200; ++i) {
-    shouldBe(f0(1), "f0(1)", 1);
-    shouldBe(f1(2, 3), "f1(2, 3)", 3);
-    shouldBe(f2(4), "f2(4)", 4);
-    shouldBe(f3(5, 6), "f3(5, 6)", 6);
-    shouldBe(f4(7)[0], "f4(7)", 7);
-    shouldBe(f5(8, 9)[1], "f5(8, 9)", 9);
-    shouldBe(f6(10)[0], "f6(10)", 10);
-    shouldBe(f7(11, 12)[1], "f7(11, 12)", 12);
-}
+test(() => {
+    for (let i = 0; i < 200; ++i) {
+        assert_equals(f0(1), 1, "f0(1)");
+        assert_equals(f1(2, 3), 3, "f1(2, 3)");
+        assert_equals(f2(4), 4, "f2(4)");
+        assert_equals(f3(5, 6), 6, "f3(5, 6)");
+        assert_equals(f4(7)[0], 7, "f4(7)");
+        assert_equals(f5(8, 9)[1], 9, "f5(8, 9)");
+        assert_equals(f6(10)[0], 10, "f6(10)");
+        assert_equals(f7(11, 12)[1], 12, "f7(11, 12)");
+    }
+});
 </script>