Cleanup: Remove some std::map::operator[] usage in ApiResourceManager.

extensions/browser/api/bluetooth_socket/bluetooth_api_socket.cc

 // Copyright 2014 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 "extensions/browser/api/bluetooth_socket/bluetooth_api_socket.h"
 
+#include "base/lazy_instance.h"
 #include "device/bluetooth/bluetooth_socket.h"
 #include "net/base/io_buffer.h"
 
 namespace {
 
 const char kSocketNotConnectedError[] = "Socket not connected";
 const char kSocketNotListeningError[] = "Socket not listening";
 
 }  // namespace
 
@@ skipping 171 matching lines @@
 
 // static
 void BluetoothApiSocket::OnSocketAcceptError(
     const ErrorCompletionCallback& error_callback,
     const std::string& message) {
   DCHECK(content::BrowserThread::CurrentlyOn(kThreadId));
   error_callback.Run(BluetoothApiSocket::kSystemError, message);
 }
 
 }  // namespace extensions