[CrOS Tether] Remove notifications when they have been tapped.

chrome/browser/chromeos/net/tether_notification_presenter.cc

 // Copyright 2017 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 "chrome/browser/chromeos/net/tether_notification_presenter.h"
 
 #include "base/bind.h"
 #include "base/memory/ptr_util.h"
 #include "base/strings/string16.h"
 #include "base/strings/utf_string_conversions.h"
@@ skipping 173 matching lines @@
 
   message_center_->RemoveNotification(std::string(kActiveHostNotificationId),
                                       false /* by_user */);
 }
 
 void TetherNotificationPresenter::OnNotificationClicked(
     const std::string& notification_id) {
   PA_LOG(INFO) << "Notification with ID " << notification_id << " was clicked.";
   settings_ui_delegate_->ShowSettingsSubPageForProfile(profile_,
                                                        kTetherSettingsSubpage);
+  message_center_->RemoveNotification(notification_id, true /* by_user */);
 }
 
 void TetherNotificationPresenter::OnNotificationButtonClicked(
     const std::string& notification_id,
     int button_index) {
   PA_LOG(INFO) << "Button at index " << button_index
                << " of notification with ID " << notification_id
                << " was clicked.";
 
   if (notification_id == kPotentialHotspotNotificationId && button_index == 0) {
     network_connect_->ConnectToNetworkId(hotspot_nearby_device_.GetDeviceId());
   }
+  message_center_->RemoveNotification(notification_id, true /* by_user */);
 }
 
 void TetherNotificationPresenter::SetSettingsUiDelegateForTesting(
     std::unique_ptr<SettingsUiDelegate> settings_ui_delegate) {
   settings_ui_delegate_ = std::move(settings_ui_delegate);
 }
 
 void TetherNotificationPresenter::ShowNotification(
     std::unique_ptr<message_center::Notification> notification) {
   std::string notification_id = notification->id();
   if (message_center_->FindVisibleNotificationById(notification_id)) {
     message_center_->UpdateNotification(notification_id,
                                         std::move(notification));
   } else {
     message_center_->AddNotification(std::move(notification));
   }
 }
 
 }  // namespace tether
 
 }  // namespace chromeos