Cleanup unreachable cert adding code

chrome/browser/chrome_content_browser_client.h

Index: chrome/browser/chrome_content_browser_client.h
diff --git a/chrome/browser/chrome_content_browser_client.h b/chrome/browser/chrome_content_browser_client.h
index e97135900c696ee022cce9edcf0326518d97fb01..b1f2989dcf59dc32da7e902b90bd402ff372cd76 100644
--- a/chrome/browser/chrome_content_browser_client.h
+++ b/chrome/browser/chrome_content_browser_client.h
@@ -184,11 +184,6 @@ class ChromeContentBrowserClient : public content::ContentBrowserClient {
       content::WebContents* web_contents,
       net::SSLCertRequestInfo* cert_request_info,
       std::unique_ptr<content::ClientCertificateDelegate> delegate) override;
-  void AddCertificate(net::CertificateMimeType cert_type,
-                      const void* cert_data,
-                      size_t cert_size,
-                      int render_process_id,
-                      int render_frame_id) override;
   content::MediaObserver* GetMediaObserver() override;
   content::PlatformNotificationService* GetPlatformNotificationService()
       override;