Move Indexed DB from dedicated thread to task scheduler

content/browser/browser_main_loop.h

 // Copyright (c) 2012 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.
 
 #ifndef CONTENT_BROWSER_BROWSER_MAIN_LOOP_H_
 #define CONTENT_BROWSER_BROWSER_MAIN_LOOP_H_
 
 #include <memory>
 
 #include "base/files/file_path.h"
@@ skipping 133 matching lines @@
     return media_stream_manager_.get();
   }
   media::UserInputMonitor* user_input_monitor() const {
     return user_input_monitor_.get();
   }
   discardable_memory::DiscardableSharedMemoryManager*
   discardable_shared_memory_manager() const {
     return discardable_shared_memory_manager_.get();
   }
   midi::MidiService* midi_service() const { return midi_service_.get(); }
-  base::Thread* indexed_db_thread() const { return indexed_db_thread_.get(); }
 
   bool is_tracing_startup_for_duration() const {
     return is_tracing_startup_for_duration_;
   }
 
   const base::FilePath& startup_trace_file() const {
     return startup_trace_file_;
   }
 
   void StopStartupTracingTimer();
@@ skipping 110 matching lines @@
   // redirection to TaskScheduler is enabled. (ref.
   // ContentBrowserClient::RedirectNonUINonIOBrowserThreadsToTaskScheduler()).
   std::unique_ptr<BrowserProcessSubThread> db_thread_;
   std::unique_ptr<BrowserProcessSubThread> file_user_blocking_thread_;
   std::unique_ptr<BrowserProcessSubThread> file_thread_;
   std::unique_ptr<BrowserProcessSubThread> process_launcher_thread_;
   std::unique_ptr<BrowserProcessSubThread> cache_thread_;
   std::unique_ptr<BrowserProcessSubThread> io_thread_;
 
   // Members initialized in |BrowserThreadsStarted()| --------------------------
-  std::unique_ptr<base::Thread> indexed_db_thread_;
   std::unique_ptr<ServiceManagerContext> service_manager_context_;
   std::unique_ptr<mojo::edk::ScopedIPCSupport> mojo_ipc_support_;
 
   // |user_input_monitor_| has to outlive |audio_manager_|, so declared first.
   std::unique_ptr<media::UserInputMonitor> user_input_monitor_;
   std::unique_ptr<media::AudioManager> audio_manager_;
   // Calls to |audio_system_| must not be posted to the audio thread if it
   // differs from the UI one. See http://crbug.com/705455.
   std::unique_ptr<media::AudioSystem> audio_system_;
 
@@ skipping 23 matching lines @@
       memory_instrumentation_coordinator_;
 
   // DO NOT add members here. Add them to the right categories above.
 
   DISALLOW_COPY_AND_ASSIGN(BrowserMainLoop);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_BROWSER_MAIN_LOOP_H_