Avoid object slicing in WebCredential::create

third_party/WebKit/public/platform/WebCredential.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 WebCredential_h
 #define WebCredential_h
 
 #include "public/platform/WebCommon.h"
 #include "public/platform/WebPrivatePtr.h"
 #include "public/platform/WebString.h"
 #include "public/platform/WebURL.h"
 
+#include <memory>
+
 namespace blink {
 
 class PlatformCredential;
 
 class WebCredential {
 public:
     BLINK_PLATFORM_EXPORT WebCredential(const WebString& id, const WebString& name, const WebURL& iconURL);
     BLINK_PLATFORM_EXPORT WebCredential(const WebCredential&);
     virtual ~WebCredential() { reset(); }
 
     BLINK_PLATFORM_EXPORT void assign(const WebCredential&);
     BLINK_PLATFORM_EXPORT void reset();
 
     BLINK_PLATFORM_EXPORT WebString id() const;
     BLINK_PLATFORM_EXPORT WebString name() const;
     BLINK_PLATFORM_EXPORT WebURL iconURL() const;
     BLINK_PLATFORM_EXPORT WebString type() const;
 
     BLINK_PLATFORM_EXPORT bool isPasswordCredential() const;
     BLINK_PLATFORM_EXPORT bool isFederatedCredential() const;
 
     // TODO(mkwst): Drop this once Chromium is updated. https://crbug.com/494880
     BLINK_PLATFORM_EXPORT bool isLocalCredential() const { return isPasswordCredential(); }
 
 #if INSIDE_BLINK
-    BLINK_PLATFORM_EXPORT static WebCredential create(PlatformCredential*);
+    BLINK_PLATFORM_EXPORT static std::unique_ptr<WebCredential> create(PlatformCredential*);
     BLINK_PLATFORM_EXPORT WebCredential& operator=(PlatformCredential*);
     BLINK_PLATFORM_EXPORT PlatformCredential* getPlatformCredential() const { return m_platformCredential.get(); }
 #endif
 
 protected:
 #if INSIDE_BLINK
     BLINK_PLATFORM_EXPORT WebCredential(PlatformCredential*);
 #endif
 
     WebPrivatePtr<PlatformCredential> m_platformCredential;
 };
 
 } // namespace blink
 
 #endif // WebCredential_h