Remove InProcessBrowserTest::SetUpOnMainThread() calls.

chrome/test/perf/mach_ports_performancetest.cc

 // Copyright 2014 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 <mach/mach.h>
 
 #include <vector>
 
 #include "base/memory/ref_counted.h"
 #include "base/strings/string_util.h"
@@ skipping 12 matching lines @@
 // the number of open ports. This is used to protect against leaking Mach ports,
 // which was the source of <http://crbug.com/105513>.
 class MachPortsTest : public InProcessBrowserTest {
  public:
   MachPortsTest() {
     embedded_test_server()->ServeFilesFromSourceDirectory(
         "data/mach_ports/moz");
   }
 
   void SetUpOnMainThread() override {
-    InProcessBrowserTest::SetUpOnMainThread();
     ASSERT_TRUE(embedded_test_server()->Start());
   }
 
   void TearDown() override {
     std::string ports;
     for (std::vector<int>::iterator it = port_counts_.begin();
          it != port_counts_.end(); ++it) {
       base::StringAppendF(&ports, "%d,", *it);
     }
     perf_test::PrintResultList("mach_ports", "", "", ports, "ports", true);
@@ skipping 60 matching lines @@
   // Close each tab, recording the number of ports after each. Do not close the
   // last tab, which is about:blank.
   for (int i = 0; i < tab_count - 1; ++i) {
     EXPECT_TRUE(
         tab_strip_model->CloseWebContentsAt(0, TabStripModel::CLOSE_NONE));
     RecordPortCount();
   }
 }
 
 }  // namespace