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

components/sync/core_impl/js_sync_encryption_handler_observer_unittest.cc

Index: components/sync/core_impl/js_sync_encryption_handler_observer_unittest.cc
diff --git a/components/sync/core_impl/js_sync_encryption_handler_observer_unittest.cc b/components/sync/core_impl/js_sync_encryption_handler_observer_unittest.cc
index 69737eb375796775a48f5967fce3d2a5a7cbe431..49a3a1428da8fd9a2b5612a3c3a863899496be34 100644
--- a/components/sync/core_impl/js_sync_encryption_handler_observer_unittest.cc
+++ b/components/sync/core_impl/js_sync_encryption_handler_observer_unittest.cc
@@ -149,14 +149,15 @@ 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();
 }