Convert //chrome/browser/extensions from scoped_ptr to std::unique_ptr

chrome/browser/extensions/api/media_galleries/media_galleries_watch_apitest.cc

 // Copyright 2014 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.
 //
 // MediaGalleries gallery watch API browser tests.
 
 #include "base/files/file_path.h"
 #include "base/files/file_path_watcher.h"
 #include "base/files/file_util.h"
 #include "base/macros.h"
@@ skipping 154 matching lines @@
     preferences->SetGalleryPermissionForExtension(*extension_, id, true);
   }
 
   void FetchMediaGalleriesList() {
     ExtensionTestMessageListener get_media_systems_finished(
         kGetMediaFileSystemsCallbackOK, false /* no reply */);
     ExecuteCmdAndCheckReply(kGetMediaFileSystemsCmd, kGetMediaFileSystemsOK);
     EXPECT_TRUE(get_media_systems_finished.WaitUntilSatisfied());
   }
 
-  scoped_ptr<EnsureMediaDirectoriesExists> ensure_media_directories_exists_;
+  std::unique_ptr<EnsureMediaDirectoriesExists>
+      ensure_media_directories_exists_;
 
   base::ScopedTempDir test_gallery_;
 
   const extensions::Extension* extension_;
 
   content::RenderViewHost* background_host_;
 
   DISALLOW_COPY_AND_ASSIGN(MediaGalleriesGalleryWatchApiTest);
 };
 
@@ skipping 94 matching lines @@
 
 IN_PROC_BROWSER_TEST_F(MediaGalleriesGalleryWatchApiTest,
                        SetupWatchOnInvalidGallery) {
   // Add gallery watch listener.
   ExecuteCmdAndCheckReply(kAddGalleryChangedListenerCmd,
                           kAddGalleryChangedListenerOK);
   // Set up a invalid gallery watch.
   ExecuteCmdAndCheckReply(
       kSetupWatchOnInvalidGalleryCmd, kAddGalleryWatchRequestFailed);
 }