arc: Partially migrate mojo types

chrome/browser/chromeos/arc/downloads_watcher/arc_downloads_watcher_service.h

 // 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.
 
 #ifndef CHROME_BROWSER_CHROMEOS_ARC_DOWNLOADS_WATCHER_ARC_DOWNLOADS_WATCHER_SERVICE_H_
 #define CHROME_BROWSER_CHROMEOS_ARC_DOWNLOADS_WATCHER_ARC_DOWNLOADS_WATCHER_SERVICE_H_
 
 #include <memory>
+#include <string>
+#include <vector>
 
 #include "base/macros.h"
 #include "base/memory/weak_ptr.h"
 #include "components/arc/arc_service.h"
 #include "components/arc/common/file_system.mojom.h"
 #include "components/arc/instance_holder.h"
-#include "mojo/public/cpp/bindings/array.h"
-#include "mojo/public/cpp/bindings/string.h"
 
 namespace base {
 class FilePath;
 }  // namespace base
 
 namespace arc {
 
 class ArcBridgeService;
 
 // Returns true if the file path has a media extension supported by Android.
@@ skipping 11 matching lines @@
   // InstanceHolder<mojom::FileSystemInstance>::Observer
   void OnInstanceReady() override;
   void OnInstanceClosed() override;
 
  private:
   class DownloadsWatcher;
 
   void StartWatchingDownloads();
   void StopWatchingDownloads();
 
-  void OnDownloadsChanged(mojo::Array<mojo::String> paths);
+  void OnDownloadsChanged(std::vector<std::string> paths);

[Yusuke Sato, 2016/11/11 17:33:37]

const std::vector<std::string>& probably?

The does not prevent accidental copy and seems error-prone. The migration doc
says "pass-by-value if the target type is move-only".

[Luis Héctor Chávez, 2016/11/11 17:53:38]

Done.

 
   std::unique_ptr<DownloadsWatcher> watcher_;
 
   // Note: This should remain the last member so it'll be destroyed and
   // invalidate the weak pointers before any other members are destroyed.
   base::WeakPtrFactory<ArcDownloadsWatcherService> weak_ptr_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(ArcDownloadsWatcherService);
 };
 
 }  // namespace arc
 
 #endif  // CHROME_BROWSER_CHROMEOS_ARC_DOWNLOADS_WATCHER_ARC_DOWNLOADS_WATCHER_SERVICE_H_