components: Remove use of MessageLoopProxy and deprecated MessageLoop APIs

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 "base/thread_task_runner_handle.h"
 #include "components/webdata/common/web_data_request_manager.h"
 #include "components/webdata/common/web_data_results.h"
 #include "components/webdata/common/web_data_service_consumer.h"
 #include "components/webdata/common/web_database_backend.h"
 
 using base::Bind;
 using base::FilePath;
 
 // Receives messages from the backend on the DB thread, posts them to
 // WebDatabaseService on the UI thread.
 class WebDatabaseService::BackendDelegate
     : public WebDatabaseBackend::Delegate {
  public:
-  BackendDelegate(
-      const base::WeakPtr<WebDatabaseService>& web_database_service)
+  BackendDelegate(const base::WeakPtr<WebDatabaseService>& web_database_service)
       : web_database_service_(web_database_service),
-        callback_thread_(base::MessageLoopProxy::current()) {
-  }
+        callback_thread_(base::ThreadTaskRunnerHandle::Get()) {}
 
   void DBLoaded(sql::InitStatus status) override {
     callback_thread_->PostTask(
         FROM_HERE,
         base::Bind(&WebDatabaseService::OnDatabaseLoadDone,
                    web_database_service_,
                    status));
   }
  private:
   const base::WeakPtr<WebDatabaseService> web_database_service_;
-  scoped_refptr<base::MessageLoopProxy> callback_thread_;
+  scoped_refptr<base::SingleThreadTaskRunner> callback_thread_;
 };
 
 WebDatabaseService::WebDatabaseService(
     const base::FilePath& path,
-    const scoped_refptr<base::MessageLoopProxy>& ui_thread,
-    const scoped_refptr<base::MessageLoopProxy>& db_thread)
+    scoped_refptr<base::SingleThreadTaskRunner> ui_thread,
+    scoped_refptr<base::SingleThreadTaskRunner> db_thread)
     : base::RefCountedDeleteOnMessageLoop<WebDatabaseService>(ui_thread),
       path_(path),
       db_loaded_(false),
       db_thread_(db_thread),
       weak_ptr_factory_(this) {
   // WebDatabaseService should be instantiated on UI thread.
   DCHECK(ui_thread->BelongsToCurrentThread());
   // WebDatabaseService requires DB thread if instantiated.
   DCHECK(db_thread.get());
 }
@@ skipping 90 matching lines @@
   } 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();
   }
 }