Remove support for NPObjects.

third_party/WebKit/LayoutTests/plugins/form-value.html

-<p>This tests that WebKit can obtain form value from plugins</p>
-<form action="" id="form">
-    <object type="application/x-webkit-test-netscape" test="form-value" name="plugin"></object>
-</form>
-<div id="console"></div>
-<script>
-if (window.testRunner) {
-    testRunner.dumpAsText();
-    testRunner.waitUntilDone();
-}
-
-function log(message) {
-    var div = document.createElement('div');
-    div.innerHTML = message;
-    var console = document.getElementById('console');
-    console.appendChild(div);
-}
-
-if (document.location.href.indexOf('?') == -1) {
-    document.getElementById('form').submit();
-} else {
-    var values = document.location.search.substring(1);
-    log('form values: "' + values + '"');
-    if (values == 'plugin=Plugin+form+value')
-        log('PASS: The form value was successfully obtained.');
-    else
-        log('FAIL: Could not obtain the form value correctly.');
-    if (window.testRunner)
-        testRunner.notifyDone();
-}
-</script>