Make PassphraseType a "enum class" instead of "enum".

components/sync/core_impl/js_sync_encryption_handler_observer_unittest.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "components/sync/core_impl/js_sync_encryption_handler_observer.h"
 
 #include "base/location.h"
 #include "base/run_loop.h"
 #include "base/values.h"
 #include "components/sync/base/cryptographer.h"
@@ skipping 131 matching lines @@
 
   js_sync_encryption_handler_observer_.OnCryptographerStateChanged(
       &cryptographer);
   PumpLoop();
 }
 
 TEST_F(JsSyncEncryptionHandlerObserverTest, OnPassphraseTypeChanged) {
   InSequence dummy;
 
   base::DictionaryValue passphrase_type_details;
-  passphrase_type_details.SetString("passphraseType", "IMPLICIT_PASSPHRASE");
+  passphrase_type_details.SetString("passphraseType",
+                                    "PassphraseType::IMPLICIT_PASSPHRASE");
   passphrase_type_details.SetInteger("explicitPassphraseTime", 10);
   EXPECT_CALL(mock_js_event_handler_,
               HandleJsEvent("onPassphraseTypeChanged",
                             HasDetailsAsDictionary(passphrase_type_details)));
 
   js_sync_encryption_handler_observer_.OnPassphraseTypeChanged(
-      IMPLICIT_PASSPHRASE, ProtoTimeToTime(10));
+      PassphraseType::IMPLICIT_PASSPHRASE, ProtoTimeToTime(10));
   PumpLoop();
 }
 
 }  // namespace
 }  // namespace syncer