drive: Move temporary file removal responsiblity to FileCache

chrome/browser/chromeos/drive/file_cache_metadata.cc

 // Copyright (c) 2012 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/chromeos/drive/file_cache_metadata.h"
 
 #include "base/callback.h"
 #include "base/file_util.h"
 #include "base/metrics/histogram.h"
 #include "base/sequenced_task_runner.h"
@@ skipping 316 matching lines @@
   }
 
   if (!CheckIfMd5Matches(md5, cache_entry)) {
     return false;
   }
 
   *entry = cache_entry;
   return true;
 }
 
-void FileCacheMetadata::RemoveTemporaryFiles() {
-  AssertOnSequencedWorkerPool();
-
-  scoped_ptr<leveldb::Iterator> iter(level_db_->NewIterator(
-      leveldb::ReadOptions()));
-  for (iter->SeekToFirst(); iter->Valid(); iter->Next()) {
-    FileCacheEntry cache_entry;
-    const bool ok = cache_entry.ParseFromArray(iter->value().data(),
-                                               iter->value().size());
-    if (ok && !cache_entry.is_persistent())
-      level_db_->Delete(leveldb::WriteOptions(), iter->key());
-  }
-}
-
 scoped_ptr<FileCacheMetadata::Iterator> FileCacheMetadata::GetIterator() {
   AssertOnSequencedWorkerPool();
 
   scoped_ptr<leveldb::Iterator> iter(level_db_->NewIterator(
       leveldb::ReadOptions()));
   return make_scoped_ptr(new Iterator(iter.Pass()));
 }
 
 void FileCacheMetadata::AssertOnSequencedWorkerPool() {
   DCHECK(!blocking_task_runner_ ||
          blocking_task_runner_->RunsTasksOnCurrentThread());
 }
 
 }  // namespace internal
 }  // namespace drive