Update code so 1:1 relation between delegate and router is more clear.

chrome/browser/extensions/api/passwords_private/passwords_private_delegate.h

Index: chrome/browser/extensions/api/passwords_private/passwords_private_delegate.h
diff --git a/chrome/browser/extensions/api/passwords_private/passwords_private_delegate.h b/chrome/browser/extensions/api/passwords_private/passwords_private_delegate.h
index df18ead3a568151a1cfd4c5bfa6e364d60e0e7d7..125184f4254317fbdd5e24f335a31dbdbe29eecc 100644
--- a/chrome/browser/extensions/api/passwords_private/passwords_private_delegate.h
+++ b/chrome/browser/extensions/api/passwords_private/passwords_private_delegate.h
@@ -38,30 +38,11 @@ class PasswordsPrivateDelegate : public KeyedService {
  public:
   ~PasswordsPrivateDelegate() override {}
 
-  // An interface used to notify clients (observers) of this object that
-  // saved passwords, password exceptions, and plaintext passwords are ready to
-  // be consumed by the UI. Register an observer via
-  // PasswordsPrivateDelegate::AddObserver().
-  class Observer {
-   public:
-    virtual void OnSavedPasswordsListChanged(
-        const std::vector<api::passwords_private::PasswordUiEntry>& entries) {}
-    virtual void OnPasswordExceptionsListChanged(
-        const std::vector<std::string>& exceptions) {}
-    virtual void OnPlaintextPasswordFetched(
-        const std::string& origin_url,
-        const std::string& username,
-        const std::string& plaintext_password) {}
+  // Sends the saved passwords list to the event router.
+  virtual void SendSavedPasswordsList() = 0;
 
-   protected:
-    virtual ~Observer() {}
-  };
-
-  // Adds |observer| to be notified when password data changes.
-  virtual void AddObserver(Observer* observer) = 0;
-
-  // Removes |observer| from the observer list.
-  virtual void RemoveObserver(Observer* observer) = 0;
+  // Sends the password exceptions list to the event router.
+  virtual void SendPasswordExceptionsList() = 0;
 
   // Removes the saved password entry corresponding to |origin_url| and
   // |username|.