Add webusb notification UI unit tests

chrome/browser/chrome_webusb_browser_client.h

 // 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.
 
 #ifndef CHROME_BROWSER_CHROME_WEBUSB_BROWSER_CLIENT_H_
 #define CHROME_BROWSER_CHROME_WEBUSB_BROWSER_CLIENT_H_
 
+#include "base/macros.h"
 #include "components/webusb/webusb_browser_client.h"
 
 class GURL;
 
 // Implementation of webusb::WebUsbBrowserClient.
 // singletons appropriate for use within the Chrome application.
 class ChromeWebUsbBrowserClient : public webusb::WebUsbBrowserClient {
  public:
   ChromeWebUsbBrowserClient();
   ~ChromeWebUsbBrowserClient() override;
 
   // webusb::WebUsbBrowserClient implementation
   void OnDeviceAdded(const base::string16& product_name,
                      const GURL& landing_page,
                      const std::string& notification_id) override;
 
   // webusb::WebUsbBrowserClient implementation
   void OnDeviceRemoved(const std::string& notification_id) override;
 
  private:
   DISALLOW_COPY_AND_ASSIGN(ChromeWebUsbBrowserClient);
 };
 
 #endif  // CHROME_BROWSER_CHROME_WEBUSB_BROWSER_CLIENT_H_