[Sync] Implement keystore migration support.

sync/internal_api/js_sync_encryption_handler_observer.cc

Index: sync/internal_api/js_sync_encryption_handler_observer.cc
diff --git a/sync/internal_api/js_sync_encryption_handler_observer.cc b/sync/internal_api/js_sync_encryption_handler_observer.cc
index 88c59ddc4ad54a7752c32f6f2efb848f6ff58a39..e2b4082a113e10525fb6dd4b8eb0fc0865fff329 100644
--- a/sync/internal_api/js_sync_encryption_handler_observer.cc
+++ b/sync/internal_api/js_sync_encryption_handler_observer.cc
@@ -97,16 +97,16 @@ void JsSyncEncryptionHandlerObserver::OnCryptographerStateChanged(
                 JsEventDetails(&details));
 }
 
-void JsSyncEncryptionHandlerObserver::OnPassphraseStateChanged(
-    PassphraseState state) {
+void JsSyncEncryptionHandlerObserver::OnPassphraseTypeChanged(
+    PassphraseType type) {
   if (!event_handler_.IsInitialized()) {
     return;
   }
   DictionaryValue details;
-  details.SetString("passphraseState",
-                    PassphraseStateToString(state));
+  details.SetString("passphraseType",
+                    PassphraseTypeToString(type));
   HandleJsEvent(FROM_HERE,
-                "onPassphraseStateChanged",
+                "onPassphraseTypeChanged",
                 JsEventDetails(&details));
 }