ppapi: PPB_VpnProvider: Implement Service Helper

chrome/browser/extensions/chrome_content_browser_client_extensions_part.cc

Index: chrome/browser/extensions/chrome_content_browser_client_extensions_part.cc
diff --git a/chrome/browser/extensions/chrome_content_browser_client_extensions_part.cc b/chrome/browser/extensions/chrome_content_browser_client_extensions_part.cc
index 36d2bc3e5c21768391b6221e257662f3fa954fc4..fcb13ca62b77bd85ca1aaf22fc4b3fd0d0817608 100644
--- a/chrome/browser/extensions/chrome_content_browser_client_extensions_part.cc
+++ b/chrome/browser/extensions/chrome_content_browser_client_extensions_part.cc
@@ -28,6 +28,7 @@
 #include "content/public/browser/render_process_host.h"
 #include "content/public/browser/render_view_host.h"
 #include "content/public/browser/site_instance.h"
+#include "content/public/browser/vpn_service_proxy.h"
 #include "content/public/browser/web_contents.h"
 #include "content/public/common/content_switches.h"
 #include "extensions/browser/api/web_request/web_request_api.h"
@@ -489,6 +490,13 @@ bool ChromeContentBrowserClientExtensionsPart::ShouldAllowOpenURL(
   return false;
 }
 
+// static
+std::unique_ptr<content::VpnServiceProxy>
+ChromeContentBrowserClientExtensionsPart::GetVpnServiceProxy(
+    content::BrowserContext* browser_context) {
+  return nullptr;
+}
+
 void ChromeContentBrowserClientExtensionsPart::RenderProcessWillLaunch(
     content::RenderProcessHost* host) {
   int id = host->GetID();