Remove InProcessBrowserTest::SetUpOnMainThread() calls.

chrome/browser/io_thread_browsertest.cc

 // Copyright 2017 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 "chrome/browser/io_thread.h"
 
 #include <memory>
 
 #include "base/command_line.h"
 #include "base/files/file_path.h"
@@ skipping 55 matching lines @@
 
   void SetUp() override {
     // Must start listening (And get a port for the proxy) before calling
     // SetUp(). Use two phase EmbeddedTestServer setup for proxy tests.
     ASSERT_TRUE(embedded_test_server()->InitializeAndListen());
     InProcessBrowserTest::SetUp();
   }
 
   void SetUpOnMainThread() override {
     embedded_test_server()->StartAcceptingConnections();
-
-    InProcessBrowserTest::SetUpOnMainThread();
   }
 
   void TearDown() override {
     // Need to stop this before |connection_listener_| is destroyed.
     EXPECT_TRUE(embedded_test_server()->ShutdownAndWaitUntilComplete());
     InProcessBrowserTest::TearDown();
   }
 };
 
 // Make sure that the system URLRequestContext does not cache responses. Main
@@ skipping 110 matching lines @@
       g_browser_process->io_thread()->system_url_request_context_getter());
   fetcher->Start();
   fetcher_delegate.WaitForCompletion();
   EXPECT_EQ(200, fetcher->GetResponseCode());
   std::string response;
   ASSERT_TRUE(fetcher->GetResponseAsString(&response));
   EXPECT_EQ("Bar", response);
 }
 
 }  // namespace