Convert //mash to define service names in mojom

ash/mus/app_list_presenter_mus.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/mus/app_list_presenter_mus.h"
 
+#include "content/public/common/service_names.mojom.h"
 #include "services/service_manager/public/cpp/connector.h"
 
 namespace ash {
 
 namespace {
 
 bool HasConnection(app_list::mojom::AppListPresenterPtr* interface_ptr) {
   return interface_ptr->is_bound() && !interface_ptr->encountered_error();
 }
 
@@ skipping 27 matching lines @@
   // TODO(mfomitchev): we have GetTargetVisibility() in mojom, but this
   // shouldn't be a synchronous method. We should go through the call sites and
   // either teach them to use a callback, or perhaps use a visibility observer.
   //  NOTIMPLEMENTED();
   return false;
 }
 
 void AppListPresenterMus::ConnectIfNeeded() {
   if (!connector_ || HasConnection(&presenter_))
     return;
-  connector_->ConnectToInterface("content_browser", &presenter_);
+  connector_->ConnectToInterface(content::mojom::kBrowserServiceName,
+                                 &presenter_);
   CHECK(HasConnection(&presenter_))
       << "Could not connect to app_list::mojom::AppListPresenter.";
 }
 
 }  // namespace ash