Convert //mash to define service names in mojom

ash/common/system/tray/system_tray_controller.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 "ash/common/system/tray/system_tray_controller.h"
 
 #include "ash/common/system/tray/system_tray_notifier.h"
 #include "ash/common/wm_shell.h"
 #include "base/bind.h"
 #include "base/bind_helpers.h"
+#include "content/public/common/service_names.mojom.h"
 #include "services/service_manager/public/cpp/connector.h"
 
 namespace ash {
 
 SystemTrayController::SystemTrayController(
     service_manager::Connector* connector)
     : connector_(connector), hour_clock_type_(base::GetHourClockType()) {}
 
 SystemTrayController::~SystemTrayController() {}
 
@@ skipping 100 matching lines @@
   // Unit tests may not have a connector.
   if (!connector_)
     return false;
 
 #if defined(OS_CHROMEOS)
   // If already connected, nothing to do.
   if (system_tray_client_.is_bound())
     return true;
 
   // Connect (or reconnect) to the interface.
-  connector_->ConnectToInterface("content_browser", &system_tray_client_);
+  connector_->ConnectToInterface(content::mojom::kBrowserServiceName,
+                                 &system_tray_client_);
 
   // Handle chrome crashes by forcing a reconnect on the next request.
   system_tray_client_.set_connection_error_handler(base::Bind(
       &SystemTrayController::OnClientConnectionError, base::Unretained(this)));
   return true;
 #else
   // The SystemTrayClient interface in the browser is only implemented for
   // Chrome OS, so don't try to connect on other platforms.
   return false;
 #endif  // defined(OS_CHROMEOS)
 }
 
 void SystemTrayController::OnClientConnectionError() {
   system_tray_client_.reset();
 }
 
 void SystemTrayController::SetUse24HourClock(bool use_24_hour) {
   hour_clock_type_ = use_24_hour ? base::k24HourClock : base::k12HourClock;
   WmShell::Get()->system_tray_notifier()->NotifyDateFormatChanged();
 }
 
 }  // namespace ash