[Sync] Move keystore key handling to SyncEncryptionHandlerImpl

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 2db5475c2ee094d8b516953e96696cae348cbaf5..88c59ddc4ad54a7752c32f6f2efb848f6ff58a39 100644
--- a/sync/internal_api/js_sync_encryption_handler_observer.cc
+++ b/sync/internal_api/js_sync_encryption_handler_observer.cc
@@ -49,13 +49,15 @@ void JsSyncEncryptionHandlerObserver::OnPassphraseAccepted() {
 }
 
 void JsSyncEncryptionHandlerObserver::OnBootstrapTokenUpdated(
-    const std::string& boostrap_token) {
+    const std::string& boostrap_token,
+    BootstrapTokenType type) {
   if (!event_handler_.IsInitialized()) {
     return;
   }
   DictionaryValue details;
   details.SetString("bootstrapToken", "<redacted>");
-  HandleJsEvent(FROM_HERE, "OnBootstrapTokenUpdated", JsEventDetails(&details));
+  details.SetString("type", BootstrapTokenTypeToString(type));
+  HandleJsEvent(FROM_HERE, "onBootstrapTokenUpdated", JsEventDetails(&details));
 }
 
 void JsSyncEncryptionHandlerObserver::OnEncryptedTypesChanged(