Avoid object slicing in WebCredential::create

third_party/WebKit/Source/platform/exported/WebCredential.cpp

Index: third_party/WebKit/Source/platform/exported/WebCredential.cpp
diff --git a/third_party/WebKit/Source/platform/exported/WebCredential.cpp b/third_party/WebKit/Source/platform/exported/WebCredential.cpp
index 11125ecd1d40121ef026aa466818c24856aa1fee..759f9fb48d15cfbc35683c06b2402c20e46ffa5c 100644
--- a/third_party/WebKit/Source/platform/exported/WebCredential.cpp
+++ b/third_party/WebKit/Source/platform/exported/WebCredential.cpp
@@ -7,23 +7,22 @@
 #include "platform/credentialmanager/PlatformCredential.h"
 #include "public/platform/WebFederatedCredential.h"
 #include "public/platform/WebPasswordCredential.h"
+#include "wtf/PtrUtil.h"
 
 namespace blink {
 
-WebCredential WebCredential::create(PlatformCredential* credential)
+std::unique_ptr<WebCredential> WebCredential::create(PlatformCredential* credential)
 {
     if (credential->isPassword()) {
-        WebPasswordCredential password(credential);
-        return password;
+        return WTF::wrapUnique(new WebPasswordCredential(credential));
     }
 
     if (credential->isFederated()) {
-        WebFederatedCredential federated(credential);
-        return federated;
+        return WTF::wrapUnique(new WebFederatedCredential(credential));
     }
 
     ASSERT_NOT_REACHED();
-    return WebCredential(credential);
+    return nullptr;
 }
 
 WebCredential::WebCredential(const WebString& id, const WebString& name, const WebURL& iconURL)