[Sync] Refactor passphrase state handling

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 1e76575860759bd7f9bc3455193615daf709f3d4..2db5475c2ee094d8b516953e96696cae348cbaf5 100644
--- a/sync/internal_api/js_sync_encryption_handler_observer.cc
+++ b/sync/internal_api/js_sync_encryption_handler_observer.cc
@@ -95,6 +95,19 @@ void JsSyncEncryptionHandlerObserver::OnCryptographerStateChanged(
                 JsEventDetails(&details));
 }
 
+void JsSyncEncryptionHandlerObserver::OnPassphraseStateChanged(
+    PassphraseState state) {
+  if (!event_handler_.IsInitialized()) {
+    return;
+  }
+  DictionaryValue details;
+  details.SetString("passphraseState",
+                    PassphraseStateToString(state));
+  HandleJsEvent(FROM_HERE,
+                "onPassphraseStateChanged",
+                JsEventDetails(&details));
+}
+
 void JsSyncEncryptionHandlerObserver::HandleJsEvent(
     const tracked_objects::Location& from_here,
     const std::string& name, const JsEventDetails& details) {