Complete UI thread blob/filesystem URL blocking and remove IO thread check.

chrome/browser/extensions/process_manager_browsertest.cc

 // Copyright 2013 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include <stddef.h>
 
 #include <memory>
 #include <utility>
 
 #include "base/callback.h"
@@ skipping 927 matching lines @@
 }
 
 // Test that navigations to blob: and filesystem: URLs with extension origins
 // are disallowed in an unprivileged, non-guest web process when the extension
 // origin corresponds to a Chrome app with the "webview" permission.  See
 // https://crbug.com/656752.  These requests should still be allowed inside
 // actual <webview> guest processes created by a Chrome app; this is checked in
 // WebViewTest.Shim_TestBlobURL.
 IN_PROC_BROWSER_TEST_F(ProcessManagerBrowserTest,
                        NestedURLNavigationsToAppBlocked) {
-  // TODO(alexmos):  Re-enable this test for PlzNavigate after tightening
-  // nested URL blocking for apps with the "webview" permission in
-  // ExtensionNavigationThrottle and removing the corresponding check from
-  // ChromeExtensionsNetworkDelegate.  The latter is incompatible with
-  // PlzNavigate.
-  if (content::IsBrowserSideNavigationEnabled())
-    return;
-
   // Disabling web security is necessary to test the browser enforcement;
   // without it, the loads in this test would be blocked by
   // SecurityOrigin::canDisplay() as invalid local resource loads.
   PrefService* prefs = browser()->profile()->GetPrefs();
   prefs->SetBoolean(prefs::kWebKitWebSecurityEnabled, false);
 
   // Load a simple app that has the "webview" permission.  The app will also
   // open a <webview> when it's loaded.
   ASSERT_TRUE(embedded_test_server()->Start());
   base::FilePath dir;
@@ skipping 277 matching lines @@
   GURL b_url(embedded_test_server()->GetURL("b.com", "/empty.html"));
   EXPECT_TRUE(content::NavigateIframeToURL(tab, "frame0", b_url));
   {
     content::RenderFrameHost* subframe = ChildFrameAt(main_frame, 0);
     EXPECT_EQ(subframe->GetProcess(), main_frame->GetProcess());
     EXPECT_EQ(subframe->GetSiteInstance(), main_frame->GetSiteInstance());
   }
 }
 
 }  // namespace extensions