Revert "content: Remove use of MessageLoopProxy and deprecated MessageLoop APIs"

content/browser/indexed_db/indexed_db_transaction.cc

 // Copyright (c) 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 "content/browser/indexed_db/indexed_db_transaction.h"
 
 #include "base/bind.h"
-#include "base/location.h"
 #include "base/logging.h"
-#include "base/single_thread_task_runner.h"
+#include "base/message_loop/message_loop.h"
 #include "base/strings/utf_string_conversions.h"
-#include "base/thread_task_runner_handle.h"
 #include "content/browser/indexed_db/indexed_db_backing_store.h"
 #include "content/browser/indexed_db/indexed_db_cursor.h"
 #include "content/browser/indexed_db/indexed_db_database.h"
 #include "content/browser/indexed_db/indexed_db_database_callbacks.h"
 #include "content/browser/indexed_db/indexed_db_tracing.h"
 #include "content/browser/indexed_db/indexed_db_transaction_coordinator.h"
 #include "third_party/WebKit/public/platform/modules/indexeddb/WebIDBDatabaseException.h"
 #include "third_party/leveldatabase/env_chromium.h"
 
 namespace content {
@@ skipping 94 matching lines @@
 
   // Not started by the coordinator yet.
   if (state_ != STARTED)
     return;
 
   // A task is already posted.
   if (should_process_queue_)
     return;
 
   should_process_queue_ = true;
-  base::ThreadTaskRunnerHandle::Get()->PostTask(
+  base::MessageLoop::current()->PostTask(
       FROM_HERE, base::Bind(&IndexedDBTransaction::ProcessTaskQueue, this));
 }
 
 void IndexedDBTransaction::Abort() {
   Abort(IndexedDBDatabaseError(blink::WebIDBDatabaseExceptionUnknownError,
                                "Internal error (unknown cause)"));
 }
 
 void IndexedDBTransaction::Abort(const IndexedDBDatabaseError& error) {
   IDB_TRACE1("IndexedDBTransaction::Abort", "txn.id", id());
@@ skipping 268 matching lines @@
       base::ASCIIToUTF16("Transaction timed out due to inactivity.")));
 }
 
 void IndexedDBTransaction::CloseOpenCursors() {
   for (auto* cursor : open_cursors_)
     cursor->Close();
   open_cursors_.clear();
 }
 
 }  // namespace content