Block navigations in extensions via ShouldTransferNavigation (not via OpenURL).

content/browser/cross_site_transfer_browsertest.cc

 // Copyright (c) 2012 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 <memory>
 
 #include "base/command_line.h"
 #include "base/files/file_path.h"
 #include "base/files/file_util.h"
 #include "base/files/scoped_temp_dir.h"
@@ skipping 136 matching lines @@
 
   DISALLOW_COPY_AND_ASSIGN(TrackingResourceDispatcherHostDelegate);
 };
 
 // WebContentsDelegate that fails to open a URL when there's a request that
 // needs to be transferred between renderers.
 class NoTransferRequestDelegate : public WebContentsDelegate {
  public:
   NoTransferRequestDelegate() {}
 
-  bool ShouldTransferNavigation() override {
+  bool ShouldTransferNavigation(bool is_main_frame_navigation) override {
     // Intentionally cancel the transfer.
     return false;
   }
 
  private:
   DISALLOW_COPY_AND_ASSIGN(NoTransferRequestDelegate);
 };
 
 class CrossSiteTransferTest : public ContentBrowserTest {
  public:
@@ skipping 321 matching lines @@
       "document.getElementsByTagName('pre')[0].innerText);",
       &actual_page_body));
   EXPECT_THAT(actual_page_body, ::testing::HasSubstr(file_content));
   EXPECT_THAT(actual_page_body,
               ::testing::HasSubstr(file_path.BaseName().AsUTF8Unsafe()));
   EXPECT_THAT(actual_page_body,
               ::testing::HasSubstr("form-data; name=\"file\""));
 }
 
 }  // namespace content