Fix getting notified twice after subscribe to notifications and call readValue

device/bluetooth/bluetooth_remote_gatt_characteristic_win.cc

 // Copyright 2016 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 "device/bluetooth/bluetooth_remote_gatt_characteristic_win.h"
 
 #include <memory>
 
 #include "base/bind.h"
 #include "base/memory/ptr_util.h"
@@ skipping 379 matching lines @@
 
   std::pair<ValueCallback, ErrorCallback> callbacks;
   callbacks.swap(read_characteristic_value_callbacks_);
   if (FAILED(hr)) {
     callbacks.second.Run(HRESULTToGattErrorCode(hr));
   } else {
     characteristic_value_.clear();
     for (ULONG i = 0; i < value->DataSize; i++)
       characteristic_value_.push_back(value->Data[i]);
 
-    parent_service_->GetWinAdapter()->NotifyGattCharacteristicValueChanged(
-        this, characteristic_value_);
-
     callbacks.first.Run(characteristic_value_);
   }
   characteristic_value_read_or_write_in_progress_ = false;
 }
 
 void BluetoothRemoteGattCharacteristicWin::
     OnWriteRemoteCharacteristicValueCallback(HRESULT hr) {
   DCHECK(ui_task_runner_->RunsTasksOnCurrentThread());
 
   std::pair<base::Closure, ErrorCallback> callbacks;
@@ skipping 57 matching lines @@
 
 void BluetoothRemoteGattCharacteristicWin::ClearIncludedDescriptors() {
   // Explicitly reset to null to ensure that calling GetDescriptor() on the
   // removed descriptor in GattDescriptorRemoved() returns null.
   for (auto& entry : included_descriptors_)
     entry.second.reset();
   included_descriptors_.clear();
 }
 
 }  // namespace device.