Replace ProximityAuthUIDelegate with ProximityAuthClient.

components/proximity_auth/webui/proximity_auth_ui.h

Index: components/proximity_auth/webui/proximity_auth_ui.h
diff --git a/components/proximity_auth/webui/proximity_auth_ui.h b/components/proximity_auth/webui/proximity_auth_ui.h
index b58992a07a7d22c315190e3b8177a1d66aa3425b..a19ec4cca793f500d930fa4facf4b6778395b13c 100644
--- a/components/proximity_auth/webui/proximity_auth_ui.h
+++ b/components/proximity_auth/webui/proximity_auth_ui.h
@@ -11,14 +11,14 @@
 
 namespace proximity_auth {
 
-class ProximityAuthUIDelegate;
+class ProximityAuthClient;
 
 // The WebUI controller for chrome://proximity-auth.
 class ProximityAuthUI : public content::WebUIController {
  public:
   // Note: |web_ui| and |delegate| are not owned by this instance and must
   // outlive this instance.
-  ProximityAuthUI(content::WebUI* web_ui, ProximityAuthUIDelegate* delegate);
+  ProximityAuthUI(content::WebUI* web_ui, ProximityAuthClient* delegate);
   ~ProximityAuthUI() override;
 
  private: