Delete a bunch of NPAPI layout tests.

LayoutTests/plugins/npruntime/script-tests/browser-object-identity.js

-description("Test that plugin doesn't get a new browser object instance each time")
-
-function gc()
-{
-    if (window.GCController)
-        return GCController.collectAll();
-
-    for (var i = 0; i < 10000; i++) { // > force garbage collection (FF requires about 9K allocations before a collect)
-        var s = new String("abc");
-    }
-}
-
-embed = document.createElement("embed");
-embed.type = "application/x-webkit-test-netscape";
-document.body.appendChild(embed);
-
-var obj = new XMLHttpRequest;
-obj.foo = "bar";
-embed.remember(obj);
-obj = null;
-gc();
-shouldBe("embed.getAndForgetRememberedObject().foo", "'bar'");
-gc();
-
-obj = new XMLHttpRequest;
-shouldBe("embed.refCount(obj)", "1");
-shouldBe("embed.refCount(obj)", "1");
-embed.remember(obj);
-shouldBe("embed.refCount(obj)", "2");
-shouldBe("embed.getRememberedObject()", "obj");
-shouldBe("embed.getRememberedObject()", "obj");
-shouldBe("embed.refCount(obj)", "2");
-shouldBe("embed.getAndForgetRememberedObject()", "obj");
-shouldBe("embed.refCount(obj)", "1");
-obj = null;
-gc();
-
-var successfullyParsed = true;