components/webdata: Cleanup callback usage in WebDatabaseService.

components/webdata/common/web_database_service.cc

 // Copyright 2013 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "components/webdata/common/web_database_service.h"
 
 #include "base/bind.h"
 #include "base/location.h"
 #include "components/webdata/common/web_data_request_manager.h"
 #include "components/webdata/common/web_data_results.h"
@@ skipping 132 matching lines @@
   return handle;
 }
 
 void WebDatabaseService::CancelRequest(WebDataServiceBase::Handle h) {
   if (!wds_backend_.get())
     return;
   wds_backend_->request_manager()->CancelRequest(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);
 }
 
 void WebDatabaseService::OnDatabaseLoadDone(sql::InitStatus status) {
   if (status == sql::INIT_OK) {
     db_loaded_ = true;
 
     for (size_t i = 0; i < loaded_callbacks_.size(); i++) {
       if (!loaded_callbacks_[i].is_null())
         loaded_callbacks_[i].Run();
     }
 
     loaded_callbacks_.clear();
   } else {
     // Notify that the database load failed.
     for (size_t i = 0; i < error_callbacks_.size(); i++) {
       if (!error_callbacks_[i].is_null())
         error_callbacks_[i].Run(status);
     }
 
     error_callbacks_.clear();
   }
 }