Avoid object slicing in WebCredential::create

third_party/WebKit/public/platform/WebCredential.h

Index: third_party/WebKit/public/platform/WebCredential.h
diff --git a/third_party/WebKit/public/platform/WebCredential.h b/third_party/WebKit/public/platform/WebCredential.h
index 858630232099d23e3dffc5d6e78e6329f61c91e6..459058a157a87ed432831e5c4d2915a73bb1d405 100644
--- a/third_party/WebKit/public/platform/WebCredential.h
+++ b/third_party/WebKit/public/platform/WebCredential.h
@@ -10,6 +10,8 @@
 #include "public/platform/WebString.h"
 #include "public/platform/WebURL.h"
 
+#include <memory>
+
 namespace blink {
 
 class PlatformCredential;
@@ -35,7 +37,7 @@ public:
     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