Fix threading issues in WebDataRequestManager.

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 <stddef.h>
 #include <utility>
 
 #include "base/bind.h"
@@ skipping 76 matching lines @@
 }
 
 scoped_refptr<WebDatabaseBackend> WebDatabaseService::GetBackend() const {
   return web_db_backend_;
 }
 
 void WebDatabaseService::ScheduleDBTask(
     const tracked_objects::Location& from_here,
     const WriteTask& task) {
   DCHECK(web_db_backend_.get());
-  std::unique_ptr<WebDataRequest> request(
-      new WebDataRequest(NULL, web_db_backend_->request_manager().get()));
+  std::unique_ptr<WebDataRequest> request =
+      web_db_backend_->request_manager()->NewRequest(nullptr);
   db_thread_->PostTask(
       from_here, Bind(&WebDatabaseBackend::DBWriteTaskWrapper, web_db_backend_,
                       task, base::Passed(&request)));
 }
 
 WebDataServiceBase::Handle WebDatabaseService::ScheduleDBTaskWithResult(
     const tracked_objects::Location& from_here,
     const ReadTask& task,
     WebDataServiceConsumer* consumer) {
   DCHECK(consumer);
   DCHECK(web_db_backend_.get());
-  std::unique_ptr<WebDataRequest> request(
-      new WebDataRequest(consumer, web_db_backend_->request_manager().get()));
+  std::unique_ptr<WebDataRequest> request =
+      web_db_backend_->request_manager()->NewRequest(consumer);
   WebDataServiceBase::Handle handle = request->GetHandle();
   db_thread_->PostTask(
       from_here, Bind(&WebDatabaseBackend::DBReadTaskWrapper, web_db_backend_,
                       task, base::Passed(&request)));
   return handle;
 }
 
 void WebDatabaseService::CancelRequest(WebDataServiceBase::Handle h) {
   if (!web_db_backend_.get())
     return;
@@ skipping 33 matching lines @@
     db_loaded_ = true;
 
     while (!loaded_callbacks_.empty()) {
       DBLoadedCallback loaded_callback = loaded_callbacks_.back();
       loaded_callbacks_.pop_back();
       if (!loaded_callback.is_null())
         loaded_callback.Run();
     }
   }
 }