Remove swapped-out usage in --site-per-process.

content/browser/site_per_process_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 "content/browser/site_per_process_browsertest.h"
 
 #include <algorithm>
 #include <vector>
 
 #include "base/command_line.h"
@@ skipping 989 matching lines @@
 IN_PROC_BROWSER_TEST_F(SitePerProcessBrowserTest,
                        KillingRendererClearsDescendantProxies) {
   GURL main_url(embedded_test_server()->GetURL(
       "a.com", "/frame_tree/page_with_two_frames_nested.html"));
   NavigateToURL(shell(), main_url);
 
   // It is safe to obtain the root frame tree node here, as it doesn't change.
   FrameTreeNode* root =
       static_cast<WebContentsImpl*>(shell()->web_contents())->
           GetFrameTree()->root();
-  TestNavigationObserver observer(shell()->web_contents());
-
   ASSERT_EQ(2U, root->child_count());
 
   GURL site_b_url(
       embedded_test_server()->GetURL(
           "bar.com", "/frame_tree/page_with_one_frame.html"));
   // We can't use a TestNavigationObserver to verify the URL here,
   // since the frame has children that may have clobbered it in the observer.
   EXPECT_EQ(site_b_url, root->child_at(0)->current_url());
 
   // Ensure that a new process is created for node2.
@@ skipping 1506 matching lines @@
       "   |--Site A\n"
       "   +--Site A\n"
       "        |--Site A\n"
       "        +--Site A\n"
       "             +--Site A\n"
       "Where A = http://127.0.0.1/",
       DepictFrameTree(root));
 }
 
 }  // namespace content