components/webdata: Cleanup callback usage in WebDatabaseService.

components/webdata/common/web_database_service.cc

Index: components/webdata/common/web_database_service.cc
diff --git a/components/webdata/common/web_database_service.cc b/components/webdata/common/web_database_service.cc
index 0bd508b555213227fb2b50ed05204b99d2b1ccfb..9a2cab33165a1398b948c1386b317ac7496d5542 100644
--- a/components/webdata/common/web_database_service.cc
+++ b/components/webdata/common/web_database_service.cc
@@ -150,12 +150,12 @@ void WebDatabaseService::CancelRequest(WebDataServiceBase::Handle h) {
 }
 
 void WebDatabaseService::RegisterDBLoadedCallback(
-    const base::Callback<void(void)>& callback) {
+    const DBLoadedCallback& callback) {
   loaded_callbacks_.push_back(callback);
 }
 
 void WebDatabaseService::RegisterDBErrorCallback(
-    const base::Callback<void(sql::InitStatus)>& callback) {
+    const DBLoadErrorCallback& callback) {
   error_callbacks_.push_back(callback);
 }