Remove InProcessBrowserTest::SetUpOnMainThread() calls.

chrome/browser/page_load_metrics/page_load_metrics_browsertest.cc

 // Copyright 2015 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 "base/command_line.h"
 #include "base/feature_list.h"
 #include "base/files/scoped_temp_dir.h"
 #include "base/logging.h"
 #include "base/macros.h"
 #include "base/memory/weak_ptr.h"
@@ skipping 304 matching lines @@
         scoped_feature_list_.InitAndEnableFeature(
             features::kPageLoadMetricsMojofication);
         break;
       default:
         CHECK(false) << "Unknown IPCType.";
         break;
     }
   }
 
   void SetUpOnMainThread() override {
-    InProcessBrowserTest::SetUpOnMainThread();
-
     content::WebContents* web_contents =
         browser()->tab_strip_model()->GetActiveWebContents();
     ipc_type_verifier_ = base::MakeUnique<IPCTypeVerifier>(web_contents);
   }
 
   // Force navigation to a new page, so the currently tracked page load runs its
   // OnComplete callback. You should prefer to use PageLoadMetricsWaiter, and
   // only use NavigateToUntrackedUrl for cases where the waiter isn't
   // sufficient.
   void NavigateToUntrackedUrl() {
@@ skipping 798 matching lines @@
 
   NavigateToUntrackedUrl();
 
   histogram_tester_.ExpectUniqueSample(internal::kHistogramTotalBytes, 0, 1);
 }
 
 INSTANTIATE_TEST_CASE_P(
     /* no prefix */,
     PageLoadMetricsBrowserTest,
     testing::Values(IPCType::LEGACY, IPCType::MOJO));