Move chrome.usb to //extensions

extensions/browser/api/usb/usb_manual_apitest.cc

 // Copyright (c) 2013 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/extensions/api/permissions/permissions_api.h"
 #include "chrome/browser/extensions/extension_apitest.h"
 
 namespace {
 
-class UsbManualApiTest : public ExtensionApiTest {
-};
+class UsbManualApiTest : public ExtensionApiTest {};
 
 }  // namespace
 
 IN_PROC_BROWSER_TEST_F(UsbManualApiTest, MANUAL_ListInterfaces) {
   extensions::PermissionsRequestFunction::SetIgnoreUserGestureForTests(true);
   extensions::PermissionsRequestFunction::SetAutoConfirmForTests(true);
   ASSERT_TRUE(RunExtensionTest("usb_manual/list_interfaces"));
 }