Remove pointless InProcessBrowserTest calls.

chrome/browser/usb/usb_browsertest.cc

 // Copyright 2016 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 <string>
 #include <utility>
 
 #include "base/command_line.h"
 #include "base/memory/ref_counted.h"
@@ skipping 76 matching lines @@
   RenderFrameHost* const render_frame_host_;
 
   DISALLOW_COPY_AND_ASSIGN(FakeChooserService);
 };
 
 class WebUsbTest : public InProcessBrowserTest {
  public:
   void SetUpCommandLine(base::CommandLine* command_line) override {
     command_line->AppendSwitch(
         switches::kEnableExperimentalWebPlatformFeatures);
-    InProcessBrowserTest::SetUpCommandLine(command_line);
   }
 
   void SetUpOnMainThread() override {
     embedded_test_server()->ServeFilesFromSourceDirectory("content/test/data");
     ASSERT_TRUE(embedded_test_server()->Start());
 
     device_client_.reset(new MockDeviceClient());
     scoped_refptr<MockUsbDevice> mock_device(
         new MockUsbDevice(0, 0, "Test Manufacturer", "Test Device", "123456"));
     device_client_->usb_service()->AddDevice(mock_device);
@@ skipping 39 matching lines @@
       web_contents,
       "navigator.usb.getDevices()"
       "    .then(devices => {"
       "        domAutomationController.send(devices.length.toString());"
       "     });",
       &result));
   EXPECT_EQ("1", result);
 }
 
 }  // namespace