Credential Manager: Pass the correct credential type to the embedder.

public/platform/WebLocalCredential.h

Index: public/platform/WebLocalCredential.h
diff --git a/public/platform/WebLocalCredential.h b/public/platform/WebLocalCredential.h
index 9822dd39f623b0dc797975dc3d53662aefca574a..a946d66e0bdcd8c20c5caba6d6712ad274df6e3a 100644
--- a/public/platform/WebLocalCredential.h
+++ b/public/platform/WebLocalCredential.h
@@ -12,15 +12,20 @@
 
 namespace blink {
 
+class PlatformLocalCredential;
+
 class WebLocalCredential : public WebCredential {
 public:
     BLINK_PLATFORM_EXPORT WebLocalCredential(const WebString& id, const WebString& name, const WebURL& avatarURL, const WebString& password);
 
     BLINK_PLATFORM_EXPORT void assign(const WebLocalCredential&);
 
-    BLINK_PLATFORM_EXPORT virtual bool isLocalCredential() const override { return true; }
-
     BLINK_PLATFORM_EXPORT WebString password() const;
+
+#if INSIDE_BLINK
+    BLINK_PLATFORM_EXPORT WebLocalCredential(PlatformCredential*);
+    BLINK_PLATFORM_EXPORT WebLocalCredential& operator=(PlatformCredential*);
+#endif
 };
 
 } // namespace blink