ppapi: PPB_VpnProvider: Implement Service Helper

chrome/browser/extensions/chrome_content_browser_client_extensions_part.cc

 // Copyright 2014 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/chrome_content_browser_client_extensions_part.h"
 
 #include <stddef.h>
 
 #include <set>
 
@@ skipping 615 matching lines @@
 #if defined(ENABLE_WEBRTC)
     command_line->AppendSwitch(::switches::kEnableWebRtcHWH264Encoding);
 #endif
     if (base::CommandLine::ForCurrentProcess()->HasSwitch(
             switches::kEnableMojoSerialService)) {
       command_line->AppendSwitch(switches::kEnableMojoSerialService);
     }
   }
 }
 
+content::VpnServiceProxy*
+ChromeContentBrowserClientExtensionsPart::GetVpnServiceProxy(
+    content::BrowserContext* browser_context) {
+  return nullptr;
+}
+
 }  // namespace extensions