Convert //mash to define service names in mojom

ash/common/new_window_client_proxy.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/new_window_client_proxy.h"
 
 #include "base/logging.h"
+#include "content/public/common/service_names.mojom.h"
 #include "services/service_manager/public/cpp/connector.h"
 
 namespace ash {
 
 NewWindowClientProxy::NewWindowClientProxy(
     service_manager::Connector* connector)
     : connector_(connector) {}
 
 NewWindowClientProxy::~NewWindowClientProxy() {}
 
@@ skipping 43 matching lines @@
 }
 
 void NewWindowClientProxy::EnsureInterface() {
   // |connector_| can be null in unit tests. We check this at first usage
   // instead of during construction because a NewWindowClientProxy is always
   // created and is then replaced with a mock in the unit tests.
   DCHECK(connector_);
 
   if (client_)
     return;
-  connector_->ConnectToInterface("content_browser", &client_);
+  connector_->ConnectToInterface(content::mojom::kBrowserServiceName, &client_);
   client_.set_connection_error_handler(base::Bind(
       &NewWindowClientProxy::OnClientConnectionError, base::Unretained(this)));
 }
 
 void NewWindowClientProxy::OnClientConnectionError() {
   client_.reset();
 }
 
 }  // namespace ash