Merge "Replace base::MessageLoopCurrent* by base::Current*Thread"

 * the old libchrome version so use the basic messageloop where that's required.

 * Elsewhere, use the SingleThreadTaskExecutor instead.

 */

#if BASE_VER >= 822064

#include <base/task/current_thread.h>

#else

#include <base/message_loop/message_loop_current.h>

#endif

#include <base/message_loop/message_pump.h>

#include <base/task/single_thread_task_executor.h>

#include <base/test/task_environment.h>