Convert //chrome/browser/sync from scoped_ptr to std::unique_ptr

chrome/browser/sync/test/integration/wifi_credentials_helper.cc

Index: chrome/browser/sync/test/integration/wifi_credentials_helper.cc
diff --git a/chrome/browser/sync/test/integration/wifi_credentials_helper.cc b/chrome/browser/sync/test/integration/wifi_credentials_helper.cc
index c9146cb7187c742c65aed6a8c1143fa29706ef2e..3f5a11500102c6ebe42ff605033b6d49a1d36f73 100644
--- a/chrome/browser/sync/test/integration/wifi_credentials_helper.cc
+++ b/chrome/browser/sync/test/integration/wifi_credentials_helper.cc
@@ -129,9 +129,10 @@ bool AllProfilesMatch() {
   return true;
 }
 
-scoped_ptr<WifiCredential> MakeWifiCredential(const std::string& ssid,
-                                              WifiSecurityClass security_class,
-                                              const std::string& passphrase) {
+std::unique_ptr<WifiCredential> MakeWifiCredential(
+    const std::string& ssid,
+    WifiSecurityClass security_class,
+    const std::string& passphrase) {
   return WifiCredential::Create(WifiCredential::MakeSsidBytesForTest(ssid),
                                 security_class,
                                 passphrase);