Make chrome/browser/media_galleries compile on Android

chrome/browser/media_galleries/media_folder_finder.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.
 
 #include "chrome/browser/media_galleries/media_folder_finder.h"
 
 #include <algorithm>
 #include <set>
 
 #include "base/files/file_enumerator.h"
@@ skipping 181 matching lines @@
   DISALLOW_COPY_AND_ASSIGN(Worker);
 };
 
 MediaFolderFinder::Worker::Worker(
     const std::vector<base::FilePath>& graylisted_folders)
     : folder_paths_are_absolute_(false),
       graylisted_folders_(graylisted_folders),
       filter_(new MediaPathFilter) {
   DCHECK_CURRENTLY_ON(BrowserThread::UI);
 
+#if !defined(OS_ANDROID)
   for (size_t i = 0; i < arraysize(kPrunedPaths); ++i) {

[no sievers, 2015/11/23 18:43:40]

is this because arraysize(kPrunedPaths) is zero on android?
because you could just add DIR_ANDROID_APP_DATA to the list then.

[mohsen, 2015/11/23 21:33:50]

Oh, cool. Done.

     base::FilePath path;
     if (PathService::Get(kPrunedPaths[i], &path))
       pruned_folders_.push_back(path);
   }
+#endif
 
   sequence_checker_.DetachFromSequence();
 }
 
 MediaFolderFinder::Worker::~Worker() {
   DCHECK(sequence_checker_.CalledOnValidSequencedThread());
 }
 
 MediaFolderFinder::WorkerReply MediaFolderFinder::Worker::ScanFolder(
     const base::FilePath& path) {
@@ skipping 218 matching lines @@
 
   if (!IsEmptyScanResult(reply.scan_result))
     results_[path] = reply.scan_result;
 
   // Push new folders to the |folders_to_scan_| in reverse order.
   std::copy(reply.new_folders.rbegin(), reply.new_folders.rend(),
             std::back_inserter(folders_to_scan_));
 
   ScanFolder();
 }