Create MetricsPrivateDelegate for metricsPrivate behavior

extensions/shell/browser/shell_extensions_api_client.h

Index: extensions/shell/browser/shell_extensions_api_client.h
diff --git a/extensions/shell/browser/shell_extensions_api_client.h b/extensions/shell/browser/shell_extensions_api_client.h
index 17a26fc78c1c7bbd2e92a844cd5b63637b938ebc..74e858fe274d3d10d4ccbff2a4e21fdbaa286a57 100644
--- a/extensions/shell/browser/shell_extensions_api_client.h
+++ b/extensions/shell/browser/shell_extensions_api_client.h
@@ -5,6 +5,8 @@
 #ifndef EXTENSIONS_SHELL_BROWSER_SHELL_EXTENSIONS_API_CLIENT_H_
 #define EXTENSIONS_SHELL_BROWSER_SHELL_EXTENSIONS_API_CLIENT_H_
 
+#include <memory>
+
 #include "extensions/browser/api/extensions_api_client.h"
 
 namespace extensions {
@@ -17,6 +19,8 @@ class ShellExtensionsAPIClient : public ExtensionsAPIClient {
   void AttachWebContentsHelpers(content::WebContents* web_contents) const
       override;
   AppViewGuestDelegate* CreateAppViewGuestDelegate() const override;
+  std::unique_ptr<MetricsPrivateDelegate> CreateMetricsPrivateDelegate()
+      const override;
 };
 
 }  // namespace extensions