Remove unused 'Credential::create' methods.

Source/modules/credentialmanager/Credential.cpp

Index: Source/modules/credentialmanager/Credential.cpp
diff --git a/Source/modules/credentialmanager/Credential.cpp b/Source/modules/credentialmanager/Credential.cpp
index b865e122ebe1d0864ad55cd43d53a5d21c6aa43e..48414333671156aa66e920cb7d9d68d83d29b198 100644
--- a/Source/modules/credentialmanager/Credential.cpp
+++ b/Source/modules/credentialmanager/Credential.cpp
@@ -10,19 +10,6 @@
 
 namespace blink {
 
-Credential* Credential::create(const String& id, const String& name, const KURL& icon)
-{
-    return new Credential(id, name, icon);
-}
-
-Credential* Credential::create(const String& id, const String& name, const String& icon, ExceptionState& exceptionState)
-{
-    KURL iconURL = parseStringAsURL(icon, exceptionState);
-    if (exceptionState.hadException())
-        return nullptr;
-    return new Credential(id, name, iconURL);
-}
-
 Credential::Credential(PlatformCredential* credential)
     : m_platformCredential(credential)
 {