Makes RenderFrameObserver/RenderViewObserver::OnDestruct pure virtual.

components/password_manager/content/renderer/credential_manager_client.h

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef COMPONENTS_PASSWORD_MANAGER_CONTENT_RENDERER_CREDENTIAL_MANAGER_CLIENT_H_
 #define COMPONENTS_PASSWORD_MANAGER_CONTENT_RENDERER_CREDENTIAL_MANAGER_CLIENT_H_
 
 #include "base/compiler_specific.h"
 #include "base/macros.h"
 #include "components/password_manager/content/public/interfaces/credential_manager.mojom.h"
@@ skipping 37 matching lines @@
   void dispatchStore(
       const blink::WebCredential& credential,
       WebCredentialManagerClient::NotificationCallbacks* callbacks) override;
   void dispatchRequireUserMediation(NotificationCallbacks* callbacks) override;
   void dispatchGet(bool zero_click_only,
                    bool include_passwords,
                    const blink::WebVector<blink::WebURL>& federations,
                    RequestCallbacks* callbacks) override;
 
  private:
+  // RenderViewObserver implementation.
+  void OnDestruct() override;
+
   void ConnectToMojoCMIfNeeded();
 
   mojom::CredentialManagerPtr mojo_cm_service_;
 
   DISALLOW_COPY_AND_ASSIGN(CredentialManagerClient);
 };
 
 }  // namespace password_manager
 
 #endif  // COMPONENTS_PASSWORD_MANAGER_CONTENT_RENDERER_CREDENTIAL_MANAGER_CLIENT_H_