Fix for TFS Merge

Author: ras0219-msft

Release/include/cpprest/web_utilities.h

@@ -121,7 +121,7 @@ class web_proxy
     /// Gets the credentials used for authentication with this proxy.
     /// </summary>
     /// <returns>Credentials to for this proxy.</returns>
-    const credentials& credentials() const { return m_credentials; }
+    const web::credentials& credentials() const { return m_credentials; }
 
     /// <summary>
     /// Sets the credentials to use for authentication with this proxy.
@@ -167,4 +167,4 @@ class web_proxy
 
 }
 
-#endif
+#endif